有没有办法在 listagg() 用完 space (>4k) 后继续下一行？
Is there a way to continue on the next row after listagg() runs out of space (>4k)?
我想将每周有多个值的 table 更改为每周将所有值排在一行中。但是当我使用 listagg() 时，我 运行 超出了 space。我无法更改最大字符串大小 (ALTER SYSTEM SET max_string_size=extended SCOPE= SPFILE)，并且我不想 t运行cate 结果字符串。但是我可以继续下一行，但我不确定该怎么做。例如，如果我的输入是：
Week SKU
202001 598441
202001 846541
202001 77557
202001 57813
202001 5741651
202001 21684135
202001 5451516
202001 545129
202001 98754123
202001 5644242
202002 68454155
...
假设输入文件足够长，它会触发错误：
01489. 00000 - "result of string concatenation is too long"
*Cause: String concatenation result is more than the maximum size.
*Action: Make sure that the result is less than the maximum size.
那我要一段类似这样的代码：
select
weeknr,
''''||listagg(sku, ''',''', ON OVERFLOW NEXT LINE) within group(order by weeknr)||'''' sku_numbers
from
input_table
group by
weeknr
这样我的输出将如下所示：
Week SKU
202001 '598441','846541','77557','57813','5741651','21684135'
202001 '5451516','545129','98754123','5644242'
202002 '68454155',...
...
这可能吗？非常感谢任何帮助！
由于LISTAGG有4000个字符的限制，切换到XML。我不认为你可以“强迫”LISTAGG 采取不同的行动。
SQL> SELECT LISTAGG (dname, ', ') WITHIN GROUP (ORDER BY dname) result FROM dept;
RESULT
--------------------------------------------------------------------------------
ACCOUNTING, OPERATIONS, RESEARCH, SALES
SQL>
SQL> SELECT RTRIM (
2 XMLAGG (XMLELEMENT (e, dname || ', ') ORDER BY dname).EXTRACT (
3 '//text()'),
4 ', ') result
5 FROM dept;
RESULT
--------------------------------------------------------------------------------
ACCOUNTING, OPERATIONS, RESEARCH, SALES
SQL>
您可以使用 MATCH_RECOGNIZE 逐行检查以查看字符串是否超过 4000 个字符，并将值分配给小于该字符的组，因此您可以使用 LISTAGG:
SELECT week,
''''||LISTAGG( sku, ''',''' ) WITHIN GROUP ( ORDER BY sku )||'''' AS skus
FROM table_name
MATCH_RECOGNIZE (
PARTITION BY Week
ORDER BY SKU
MEASURES
MATCH_NUMBER() AS mno
ALL ROWS PER MATCH
PATTERN ( concatenated_string+ )
DEFINE
concatenated_string AS SUM(LENGTH(SKU)+3)-1 <= 4000
)
GROUP BY week, mno
其中，对于示例数据：
CREATE TABLE table_name ( Week, SKU ) AS
SELECT *
FROM (
SELECT 202001 AS week, 10000000+LEVEL AS sku FROM DUAL CONNECT BY LEVEL <= 500
UNION ALL
SELECT 202002, 10000000+LEVEL FROM DUAL CONNECT BY LEVEL <= 100
)
ORDER BY week, DBMS_RANDOM.VALUE; -- put the rows into a random order in the table.
输出：
WEEK | SKUS
-----: | :-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
202001 | '10000001','10000002','10000003','10000004','10000005','10000006','10000007','10000008','10000009','10000010','10000011','10000012','10000013','10000014','10000015','10000016','10000017','10000018','10000019','10000020','10000021','10000022','10000023','10000024','10000025','10000026','10000027','10000028','10000029','10000030','10000031','10000032','10000033','10000034','10000035','10000036','10000037','10000038','10000039','10000040','10000041','10000042','10000043','10000044','10000045','10000046','10000047','10000048','10000049','10000050','10000051','10000052','10000053','10000054','10000055','10000056','10000057','10000058','10000059','10000060','10000061','10000062','10000063','10000064','10000065','10000066','10000067','10000068','10000069','10000070','10000071','10000072','10000073','10000074','10000075','10000076','10000077','10000078','10000079','10000080','10000081','10000082','10000083','10000084','10000085','10000086','10000087','10000088','10000089','10000090','10000091','10000092','10000093','10000094','10000095','10000096','10000097','10000098','10000099','10000100','10000101','10000102','10000103','10000104','10000105','10000106','10000107','10000108','10000109','10000110','10000111','10000112','10000113','10000114','10000115','10000116','10000117','10000118','10000119','10000120','10000121','10000122','10000123','10000124','10000125','10000126','10000127','10000128','10000129','10000130','10000131','10000132','10000133','10000134','10000135','10000136','10000137','10000138','10000139','10000140','10000141','10000142','10000143','10000144','10000145','10000146','10000147','10000148','10000149','10000150','10000151','10000152','10000153','10000154','10000155','10000156','10000157','10000158','10000159','10000160','10000161','10000162','10000163','10000164','10000165','10000166','10000167','10000168','10000169','10000170','10000171','10000172','10000173','10000174','10000175','10000176','10000177','10000178','10000179','10000180','10000181','10000182','10000183','10000184','10000185','10000186','10000187','10000188','10000189','10000190','10000191','10000192','10000193','10000194','10000195','10000196','10000197','10000198','10000199','10000200','10000201','10000202','10000203','10000204','10000205','10000206','10000207','10000208','10000209','10000210','10000211','10000212','10000213','10000214','10000215','10000216','10000217','10000218','10000219','10000220','10000221','10000222','10000223','10000224','10000225','10000226','10000227','10000228','10000229','10000230','10000231','10000232','10000233','10000234','10000235','10000236','10000237','10000238','10000239','10000240','10000241','10000242','10000243','10000244','10000245','10000246','10000247','10000248','10000249','10000250','10000251','10000252','10000253','10000254','10000255','10000256','10000257','10000258','10000259','10000260','10000261','10000262','10000263','10000264','10000265','10000266','10000267','10000268','10000269','10000270','10000271','10000272','10000273','10000274','10000275','10000276','10000277','10000278','10000279','10000280','10000281','10000282','10000283','10000284','10000285','10000286','10000287','10000288','10000289','10000290','10000291','10000292','10000293','10000294','10000295','10000296','10000297','10000298','10000299','10000300','10000301','10000302','10000303','10000304','10000305','10000306','10000307','10000308','10000309','10000310','10000311','10000312','10000313','10000314','10000315','10000316','10000317','10000318','10000319','10000320','10000321','10000322','10000323','10000324','10000325','10000326','10000327','10000328','10000329','10000330','10000331','10000332','10000333','10000334','10000335','10000336','10000337','10000338','10000339','10000340','10000341','10000342','10000343','10000344','10000345','10000346','10000347','10000348','10000349','10000350','10000351','10000352','10000353','10000354','10000355','10000356','10000357','10000358','10000359','10000360','10000361','10000362','10000363'
202001 | '10000364','10000365','10000366','10000367','10000368','10000369','10000370','10000371','10000372','10000373','10000374','10000375','10000376','10000377','10000378','10000379','10000380','10000381','10000382','10000383','10000384','10000385','10000386','10000387','10000388','10000389','10000390','10000391','10000392','10000393','10000394','10000395','10000396','10000397','10000398','10000399','10000400','10000401','10000402','10000403','10000404','10000405','10000406','10000407','10000408','10000409','10000410','10000411','10000412','10000413','10000414','10000415','10000416','10000417','10000418','10000419','10000420','10000421','10000422','10000423','10000424','10000425','10000426','10000427','10000428','10000429','10000430','10000431','10000432','10000433','10000434','10000435','10000436','10000437','10000438','10000439','10000440','10000441','10000442','10000443','10000444','10000445','10000446','10000447','10000448','10000449','10000450','10000451','10000452','10000453','10000454','10000455','10000456','10000457','10000458','10000459','10000460','10000461','10000462','10000463','10000464','10000465','10000466','10000467','10000468','10000469','10000470','10000471','10000472','10000473','10000474','10000475','10000476','10000477','10000478','10000479','10000480','10000481','10000482','10000483','10000484','10000485','10000486','10000487','10000488','10000489','10000490','10000491','10000492','10000493','10000494','10000495','10000496','10000497','10000498','10000499','10000500'
202002 | '10000001','10000002','10000003','10000004','10000005','10000006','10000007','10000008','10000009','10000010','10000011','10000012','10000013','10000014','10000015','10000016','10000017','10000018','10000019','10000020','10000021','10000022','10000023','10000024','10000025','10000026','10000027','10000028','10000029','10000030','10000031','10000032','10000033','10000034','10000035','10000036','10000037','10000038','10000039','10000040','10000041','10000042','10000043','10000044','10000045','10000046','10000047','10000048','10000049','10000050','10000051','10000052','10000053','10000054','10000055','10000056','10000057','10000058','10000059','10000060','10000061','10000062','10000063','10000064','10000065','10000066','10000067','10000068','10000069','10000070','10000071','10000072','10000073','10000074','10000075','10000076','10000077','10000078','10000079','10000080','10000081','10000082','10000083','10000084','10000085','10000086','10000087','10000088','10000089','10000090','10000091','10000092','10000093','10000094','10000095','10000096','10000097','10000098','10000099','10000100'
db<>fiddle here
您可以创建自己的函数：
CREATE OR REPLACE TYPE VARCHAR_TABLE_TYPE AS TABLE OF VARCHAR2(30000);
CREATE OR REPLACE FUNCTION JoinTable(tab IN VARCHAR_TABLE_TYPE, Joiner IN VARCHAR2) RETURN VARCHAR2 IS
res VARCHAR2(30000); -- or even: res CLOB;
BEGIN
IF tab IS NULL THEN
RETURN NULL;
END IF;
IF tab.COUNT = 0 THEN
RETURN NULL;
END IF;
FOR i IN tab.FIRST..tab.LAST-1 LOOP
res := res || tab(i) || Joiner;
END LOOP;
RETURN res || tab(tab.LAST);
END JoinTable;
那么你可以这样使用它：
SELECT
JoinTable(
CAST(MULTISET(SELECT sku FROM input_table order by weeknr) AS VARCHAR_TABLE_TYPE),
','
) as sku_numbers
from dual
您可以使用解析函数求出字符串长度的SUM，然后将其用于子分组，如下所示：
SELECT WEEKNR,
'''' || LISTAGG(SKU, ''',''') WITHIN GROUP(ORDER BY WEEKNR) || '''' SKU_NUMBERS
FROM (
SELECT WEEKNR,
FLOOR(SUM(LENGTH(SKU) + 3)
OVER(PARTITION BY WEEKNR ORDER BY SKU) / 4000) AS GROUP_NUMBER,
SKU
FROM INPUT_TABLE
)
GROUP BY WEEKNR, GROUP_NUMBER
我想将每周有多个值的 table 更改为每周将所有值排在一行中。但是当我使用 listagg() 时，我 运行 超出了 space。我无法更改最大字符串大小 (ALTER SYSTEM SET max_string_size=extended SCOPE= SPFILE)，并且我不想 t运行cate 结果字符串。但是我可以继续下一行，但我不确定该怎么做。例如，如果我的输入是：
Week SKU
202001 598441
202001 846541
202001 77557
202001 57813
202001 5741651
202001 21684135
202001 5451516
202001 545129
202001 98754123
202001 5644242
202002 68454155
...
假设输入文件足够长，它会触发错误：
01489. 00000 - "result of string concatenation is too long"
*Cause: String concatenation result is more than the maximum size.
*Action: Make sure that the result is less than the maximum size.
那我要一段类似这样的代码：
select
weeknr,
''''||listagg(sku, ''',''', ON OVERFLOW NEXT LINE) within group(order by weeknr)||'''' sku_numbers
from
input_table
group by
weeknr
这样我的输出将如下所示：
Week SKU
202001 '598441','846541','77557','57813','5741651','21684135'
202001 '5451516','545129','98754123','5644242'
202002 '68454155',...
...
这可能吗？非常感谢任何帮助！
由于LISTAGG有4000个字符的限制，切换到XML。我不认为你可以“强迫”LISTAGG 采取不同的行动。
SQL> SELECT LISTAGG (dname, ', ') WITHIN GROUP (ORDER BY dname) result FROM dept;
RESULT
--------------------------------------------------------------------------------
ACCOUNTING, OPERATIONS, RESEARCH, SALES
SQL>
SQL> SELECT RTRIM (
2 XMLAGG (XMLELEMENT (e, dname || ', ') ORDER BY dname).EXTRACT (
3 '//text()'),
4 ', ') result
5 FROM dept;
RESULT
--------------------------------------------------------------------------------
ACCOUNTING, OPERATIONS, RESEARCH, SALES
SQL>
您可以使用 MATCH_RECOGNIZE 逐行检查以查看字符串是否超过 4000 个字符，并将值分配给小于该字符的组，因此您可以使用 LISTAGG:
SELECT week,
''''||LISTAGG( sku, ''',''' ) WITHIN GROUP ( ORDER BY sku )||'''' AS skus
FROM table_name
MATCH_RECOGNIZE (
PARTITION BY Week
ORDER BY SKU
MEASURES
MATCH_NUMBER() AS mno
ALL ROWS PER MATCH
PATTERN ( concatenated_string+ )
DEFINE
concatenated_string AS SUM(LENGTH(SKU)+3)-1 <= 4000
)
GROUP BY week, mno
其中，对于示例数据：
CREATE TABLE table_name ( Week, SKU ) AS
SELECT *
FROM (
SELECT 202001 AS week, 10000000+LEVEL AS sku FROM DUAL CONNECT BY LEVEL <= 500
UNION ALL
SELECT 202002, 10000000+LEVEL FROM DUAL CONNECT BY LEVEL <= 100
)
ORDER BY week, DBMS_RANDOM.VALUE; -- put the rows into a random order in the table.
输出：
WEEK | SKUS -----: | :------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- 202001 | '10000001','10000002','10000003','10000004','10000005','10000006','10000007','10000008','10000009','10000010','10000011','10000012','10000013','10000014','10000015','10000016','10000017','10000018','10000019','10000020','10000021','10000022','10000023','10000024','10000025','10000026','10000027','10000028','10000029','10000030','10000031','10000032','10000033','10000034','10000035','10000036','10000037','10000038','10000039','10000040','10000041','10000042','10000043','10000044','10000045','10000046','10000047','10000048','10000049','10000050','10000051','10000052','10000053','10000054','10000055','10000056','10000057','10000058','10000059','10000060','10000061','10000062','10000063','10000064','10000065','10000066','10000067','10000068','10000069','10000070','10000071','10000072','10000073','10000074','10000075','10000076','10000077','10000078','10000079','10000080','10000081','10000082','10000083','10000084','10000085','10000086','10000087','10000088','10000089','10000090','10000091','10000092','10000093','10000094','10000095','10000096','10000097','10000098','10000099','10000100','10000101','10000102','10000103','10000104','10000105','10000106','10000107','10000108','10000109','10000110','10000111','10000112','10000113','10000114','10000115','10000116','10000117','10000118','10000119','10000120','10000121','10000122','10000123','10000124','10000125','10000126','10000127','10000128','10000129','10000130','10000131','10000132','10000133','10000134','10000135','10000136','10000137','10000138','10000139','10000140','10000141','10000142','10000143','10000144','10000145','10000146','10000147','10000148','10000149','10000150','10000151','10000152','10000153','10000154','10000155','10000156','10000157','10000158','10000159','10000160','10000161','10000162','10000163','10000164','10000165','10000166','10000167','10000168','10000169','10000170','10000171','10000172','10000173','10000174','10000175','10000176','10000177','10000178','10000179','10000180','10000181','10000182','10000183','10000184','10000185','10000186','10000187','10000188','10000189','10000190','10000191','10000192','10000193','10000194','10000195','10000196','10000197','10000198','10000199','10000200','10000201','10000202','10000203','10000204','10000205','10000206','10000207','10000208','10000209','10000210','10000211','10000212','10000213','10000214','10000215','10000216','10000217','10000218','10000219','10000220','10000221','10000222','10000223','10000224','10000225','10000226','10000227','10000228','10000229','10000230','10000231','10000232','10000233','10000234','10000235','10000236','10000237','10000238','10000239','10000240','10000241','10000242','10000243','10000244','10000245','10000246','10000247','10000248','10000249','10000250','10000251','10000252','10000253','10000254','10000255','10000256','10000257','10000258','10000259','10000260','10000261','10000262','10000263','10000264','10000265','10000266','10000267','10000268','10000269','10000270','10000271','10000272','10000273','10000274','10000275','10000276','10000277','10000278','10000279','10000280','10000281','10000282','10000283','10000284','10000285','10000286','10000287','10000288','10000289','10000290','10000291','10000292','10000293','10000294','10000295','10000296','10000297','10000298','10000299','10000300','10000301','10000302','10000303','10000304','10000305','10000306','10000307','10000308','10000309','10000310','10000311','10000312','10000313','10000314','10000315','10000316','10000317','10000318','10000319','10000320','10000321','10000322','10000323','10000324','10000325','10000326','10000327','10000328','10000329','10000330','10000331','10000332','10000333','10000334','10000335','10000336','10000337','10000338','10000339','10000340','10000341','10000342','10000343','10000344','10000345','10000346','10000347','10000348','10000349','10000350','10000351','10000352','10000353','10000354','10000355','10000356','10000357','10000358','10000359','10000360','10000361','10000362','10000363' 202001 | '10000364','10000365','10000366','10000367','10000368','10000369','10000370','10000371','10000372','10000373','10000374','10000375','10000376','10000377','10000378','10000379','10000380','10000381','10000382','10000383','10000384','10000385','10000386','10000387','10000388','10000389','10000390','10000391','10000392','10000393','10000394','10000395','10000396','10000397','10000398','10000399','10000400','10000401','10000402','10000403','10000404','10000405','10000406','10000407','10000408','10000409','10000410','10000411','10000412','10000413','10000414','10000415','10000416','10000417','10000418','10000419','10000420','10000421','10000422','10000423','10000424','10000425','10000426','10000427','10000428','10000429','10000430','10000431','10000432','10000433','10000434','10000435','10000436','10000437','10000438','10000439','10000440','10000441','10000442','10000443','10000444','10000445','10000446','10000447','10000448','10000449','10000450','10000451','10000452','10000453','10000454','10000455','10000456','10000457','10000458','10000459','10000460','10000461','10000462','10000463','10000464','10000465','10000466','10000467','10000468','10000469','10000470','10000471','10000472','10000473','10000474','10000475','10000476','10000477','10000478','10000479','10000480','10000481','10000482','10000483','10000484','10000485','10000486','10000487','10000488','10000489','10000490','10000491','10000492','10000493','10000494','10000495','10000496','10000497','10000498','10000499','10000500' 202002 | '10000001','10000002','10000003','10000004','10000005','10000006','10000007','10000008','10000009','10000010','10000011','10000012','10000013','10000014','10000015','10000016','10000017','10000018','10000019','10000020','10000021','10000022','10000023','10000024','10000025','10000026','10000027','10000028','10000029','10000030','10000031','10000032','10000033','10000034','10000035','10000036','10000037','10000038','10000039','10000040','10000041','10000042','10000043','10000044','10000045','10000046','10000047','10000048','10000049','10000050','10000051','10000052','10000053','10000054','10000055','10000056','10000057','10000058','10000059','10000060','10000061','10000062','10000063','10000064','10000065','10000066','10000067','10000068','10000069','10000070','10000071','10000072','10000073','10000074','10000075','10000076','10000077','10000078','10000079','10000080','10000081','10000082','10000083','10000084','10000085','10000086','10000087','10000088','10000089','10000090','10000091','10000092','10000093','10000094','10000095','10000096','10000097','10000098','10000099','10000100'
db<>fiddle here
您可以创建自己的函数：
CREATE OR REPLACE TYPE VARCHAR_TABLE_TYPE AS TABLE OF VARCHAR2(30000);
CREATE OR REPLACE FUNCTION JoinTable(tab IN VARCHAR_TABLE_TYPE, Joiner IN VARCHAR2) RETURN VARCHAR2 IS
res VARCHAR2(30000); -- or even: res CLOB;
BEGIN
IF tab IS NULL THEN
RETURN NULL;
END IF;
IF tab.COUNT = 0 THEN
RETURN NULL;
END IF;
FOR i IN tab.FIRST..tab.LAST-1 LOOP
res := res || tab(i) || Joiner;
END LOOP;
RETURN res || tab(tab.LAST);
END JoinTable;
那么你可以这样使用它：
SELECT
JoinTable(
CAST(MULTISET(SELECT sku FROM input_table order by weeknr) AS VARCHAR_TABLE_TYPE),
','
) as sku_numbers
from dual
您可以使用解析函数求出字符串长度的SUM，然后将其用于子分组，如下所示：
SELECT WEEKNR,
'''' || LISTAGG(SKU, ''',''') WITHIN GROUP(ORDER BY WEEKNR) || '''' SKU_NUMBERS
FROM (
SELECT WEEKNR,
FLOOR(SUM(LENGTH(SKU) + 3)
OVER(PARTITION BY WEEKNR ORDER BY SKU) / 4000) AS GROUP_NUMBER,
SKU
FROM INPUT_TABLE
)
GROUP BY WEEKNR, GROUP_NUMBER