如何在WHERE子句中使用SELECT语句编写SQL DELETE语句？

How to write a SQL DELETE statement with a SELECT statement in the WHERE clause?

数据库：Sybase Advantage 11

在我寻求规范化数据的过程中，我试图删除我从这个SELECT语句中得到的结果：

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SELECT tableA.entitynum
FROM tableA q
INNER JOIN tableB u ON (u.qlabel = q.entityrole AND u.fieldnum = q.fieldnum)
WHERE (LENGTH(q.memotext) NOT IN (8,9,10)
OR q.memotext NOT LIKE '%/%/%')
AND (u.FldFormat = 'Date')
;

这是我提出的DELETE声明：

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DELETE FROM tableA
WHERE (SELECT q.entitynum
FROM tableA q
INNER JOIN tableB u ON (u.qlabel = q.entityrole AND u.fieldnum = q.fieldnum)
WHERE (LENGTH(q.memotext) NOT IN (8,9,10)
OR q.memotext NOT LIKE '%/%/%')
AND (u.FldFormat = 'Date'))
;

号

当我尝试运行此语句时，我会不断收到此错误：

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ERROR IN SCRIPT: poQuery: Error 7200: AQE Error: State = S0000; NativeError = 2124;
[iAnywhere Solutions][Advantage SQL Engine]Invalid operand FOR operator: = BOOLEAN VALUE
cannot be operated WITH non-BOOLEAN VALUE.

我也尝试过这种说法：

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DELETE FROM tableA
INNER JOIN tableB u ON (u.qlabel = tableA.entityrole AND u.fieldnum = tableA.fieldnum)
WHERE (LENGTH(q.memotext) NOT IN (8,9,10)
OR tableA.memotext NOT LIKE '%/%/%')
AND (u.FldFormat = 'Date')
;

。

结果是：

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ERROR IN SCRIPT: poQuery: Error 7200: AQE Error: State = 42000; NativeError = 2117;
[iAnywhere Solutions][Advantage SQL Engine] Unexpected token: INNER -- Expecting semicolon.
-- Location of error in the SQL statement is: 23 (line: 2 column: 1)

有人能帮助我正确地构造一个删除查询，从而删除正确的数据吗？

相关讨论

您需要在表A中标识主键，以便删除正确的记录。主键可以是单列，也可以是唯一标识表中某一行的多个列的组合。如果没有主键，则可以使用rowid伪列作为主键。

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DELETE FROM tableA
WHERE ROWID IN
( SELECT q.ROWID
FROM tableA q
INNER JOIN tableB u ON (u.qlabel = q.entityrole AND u.fieldnum = q.fieldnum)
WHERE (LENGTH(q.memotext) NOT IN (8,9,10) OR q.memotext NOT LIKE '%/%/%')
AND (u.FldFormat = 'Date'));

。

相关讨论

您的第二个DELETE查询几乎是正确的。只需确保将表名(或别名)放在DELETE和FROM之间，以指定要从中删除的表。这比像在其他答案中那样使用嵌套的SELECT语句要简单。

已更正的查询(选项1:使用完整表名)：

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DELETE tableA
FROM tableA
INNER JOIN tableB u ON (u.qlabel = tableA.entityrole AND u.fieldnum = tableA.fieldnum)
WHERE (LENGTH(tableA.memotext) NOT IN (8,9,10)
OR tableA.memotext NOT LIKE '%/%/%')
AND (u.FldFormat = 'Date')

已更正的查询(选项2:使用别名)：

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DELETE q
FROM tableA q
INNER JOIN tableB u ON (u.qlabel = q.entityrole AND u.fieldnum = q.fieldnum)
WHERE (LENGTH(q.memotext) NOT IN (8,9,10)
OR q.memotext NOT LIKE '%/%/%')
AND (u.FldFormat = 'Date')

。

更多示例如下：如何使用与SQL Server的内部联接删除？

相关讨论

你不应该有：

1	DELETE FROM tableA WHERE entitynum IN (...your SELECT...)

现在你只需要一个没有比较的地方：

1	DELETE FROM tableA WHERE (...your SELECT...)

号

所以您的最终查询如下所示：

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DELETE FROM tableA WHERE entitynum IN (
SELECT tableA.entitynum FROM tableA q
INNER JOIN tableB u ON (u.qlabel = q.entityrole AND u.fieldnum = q.fieldnum)
WHERE (LENGTH(q.memotext) NOT IN (8,9,10) OR q.memotext NOT LIKE '%/%/%')
AND (u.FldFormat = 'Date')
)

相关讨论

在这种情况下：

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。

是否缺少要与之比较的列？例子：

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DELETE FROM tableA
WHERE entitynum IN (SELECT q.entitynum
FROM tableA q
INNER JOIN tableB u ON (u.qlabel = q.entityrole AND u.fieldnum = q.fieldnum)
WHERE (LENGTH(q.memotext) NOT IN (8,9,10)
OR q.memotext NOT LIKE '%/%/%')
AND (u.FldFormat = 'Date'));

我假设它是该列，因为在select语句中，您要从要用该列删除的同一个表中进行选择。

相关讨论

做过类似的事情：

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CREATE TABLE exclusions(excl VARCHAR(250));
INSERT INTO exclusions(excl)
VALUES
('%timeline%'),
('%Placeholders%'),
('%Stages%'),
('%master_stage_1205x465%'),
('%Accessories%'),
('%chosen-sprite.png'),
('%WebResource.axd');
GO
CREATE VIEW ToBeDeleted AS
SELECT * FROM chunks
WHERE chunks.file_id IN
(
SELECT DISTINCT
lf.file_id
FROM LargeFiles lf
WHERE lf.file_id NOT IN
(
SELECT DISTINCT
lf.file_id
FROM LargeFiles lf
LEFT JOIN exclusions e ON(lf.URL LIKE e.excl)
WHERE e.excl IS NULL
)
);
GO
CHECKPOINT
GO
SET NOCOUNT ON;
DECLARE @r INT;
SET @r = 1;
WHILE @r>0

BEGIN
DELETE TOP (10000) FROM ToBeDeleted;
SET @r = @@ROWCOUNT
END
GO

。