查看与您的 MariaDB 服务器版本对应的手册，了解要使用的正确语法

Question

我正在尝试制作 sql 语法：

UPDATE `%s`
JOIN (WITH t2 AS
(
SELECT LAG(storymain_id,1) OVER (ORDER BY storymain_id) AS lg, `%s`.* 
FROM `%s`
)
SELECT t2.*,
1 + SUM(CASE WHEN COALESCE(lg,storymain_id) = storymain_id THEN 0 ELSE 1 END ) 
OVER (ORDER BY storymain_id) AS new_id
FROM t2 ) t2
ON `%s`.storymain_id = t2.storymain_id SET `%s`.storymain_id = t2.new_id;

在我的 maria-db 服务器上，版本是：

mysql  Ver 15.1 Distrib 10.1.44-MariaDB, for debian-linux-gnu (x86_64) using readline 5.2

我在运行时遇到错误：

SQLSTATE[42000]:
Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that 
corresponds to your MariaDB Server version for the right syntax to use near 't2 AS\r\n\t\t\t\t 
(\r\n\t\t\t\t\tSELECT LAG(storymain_id, 1) OVER (ORDER BY storymain_id) AS' at line ~.

我需要让它工作，但我不知道如何更改语法..

感谢您的帮助...

Answer 1

我只是将 cte 替换为正常派生的 table。您没有在查询中只使用一次 cte，所以这并不重要：

update `%s`
join (
    select 
        t2.*,
        1 + sum(case when coalesce(lg,storymain_id) = storymain_id then 0 else 1 end) 
            over (order by storymain_id) as new_id
    from (
        select 
            lag(storymain_id,1) over (order by storymain_id) as lg, 
            `%s`.* 
        from `%s`
    ) t2
) t2
on `%s`.storymain_id = t2.storymain_id 
set `%s`.storymain_id = t2.new_id;

否则，MySQL 需要 with 语句开头的子句：

with t2 as (
    select 
        lag(storymain_id,1) over (order by storymain_id) as lg, 
        `%s`.* 
    from `%s`
)
update `%s`
join (
    select 
        t2.*,
        1 + sum(case when coalesce(lg,storymain_id) = storymain_id then 0 else 1 end) 
            over (order by storymain_id) as new_id
    from t2
) t
on `%s`.storymain_id = t.storymain_id 
set `%s`.storymain_id = t.new_id;

Reference:

A WITH clause is permitted in these contexts:

At the beginning of SELECT, UPDATE, and DELETE statements.

WITH ... SELECT ...

WITH ... UPDATE ...

WITH ... DELETE ...

查看与您的 MariaDB 服务器版本对应的手册，了解要使用的正确语法

Check the manual the corresponds to your MariaDB server version for the right syntax to use

sql

common-table-expression

mariadb

sql-update