在 Oracle 的 Where 子查询中使用别名或 table 名称，

Question

我需要在我的查询中显示来自其他 table 的一些字段，但出现此错误：

ORA-00904: "THIS_"."ID": 标识符无效 00904. 00000 - “%s：无效标识符”

这是查询

SELECT this_."ID" as ID1_47_2_
FROM "ENSAIO_AMOSTRA" this_
inner join "ETAPA_FLUXO_AMOSTRA" efe1_ on  this_."ID" = efe1_."ID_ENSAIO_AMOSTRA"
inner join "ETAPA" et2_ on efe1_."ID_ETAPA"=et2_."ID"
WHERE et2_."ID" in (5) and not (et2_."ID" = 6)
and this_."ID_ENSAIO" = 835
and efe1_."ID" = (
    select y0_ from
    ( SELECT this_0_."ID" as y0_
      FROM "ETAPA_FLUXO_AMOSTRA" this_0_
      WHERE this_0_."ID_ENSAIO_AMOSTRA" = this_."ID"
      ORDER BY this_0_."ID" desc )
)

如果我将 this_."ID" 更改为一个数字（一个已经存在的 ensaio_amostra），它将起作用。

我该怎么办？

Answer 1

and efe1_."ID" = (
    select y0_ from
    ( SELECT this_0_."ID" as y0_
      FROM "ETAPA_FLUXO_AMOSTRA" this_0_
      WHERE this_0_."ID_ENSAIO_AMOSTRA" = this_."ID"
      ORDER BY this_0_."ID" desc )
)

您不需要 子查询，因为您已经使用 INNER JOIN 子句连接表：

FROM "ENSAIO_AMOSTRA" this_
inner join "ETAPA_FLUXO_AMOSTRA" efe1_ on  this_."ID" = efe1_."ID_ENSAIO_AMOSTRA"

只需使用：

SELECT this_."ID" AS ID1_47_2_
FROM "ENSAIO_AMOSTRA" this_
INNER JOIN "ETAPA_FLUXO_AMOSTRA" efe1_
ON this_."ID" = efe1_."ID_ENSAIO_AMOSTRA"
INNER JOIN "ETAPA" et2_
ON efe1_."ID_ETAPA"   =et2_."ID"
WHERE et2_."ID"      IN (5)
AND NOT (et2_."ID"    = 6)
AND this_."ID_ENSAIO" = 835;

附带说明，子查询中的 ORDER BY 没有意义。此外，如果您在子查询中得到不止一行，它无论如何都会失败。

在 Oracle 的 Where 子查询中使用别名或 table 名称，

Use an Alias or table name in Where Clause Subquery in Oracle,

sql

oracle

subquery

oracle11g