如何解决尝试在SQL WHERE IN语句中使用变量
我正在尝试使用@List表来提供Where IN语句。我不断收到错误消息,“必须声明标量变量“ @List”。
我知道我可以在WHERE IN部分中简单地使用select语句,但是我需要从概念上找出对于无法共享全部内容的较大SQL语句是否可行。
DECLARE @EarliestDate date Set @EarliestDate = '2020-01-01'
DECLARE @LatestDate date Set @LatestDate = '2020-01-05'
DECLARE @List TABLE(DATAPOINT varchar(20))
INSERT INTO @List SELECT number1 + CONVERT(varchar(5),number2)
FROM
tbl1
INNER JOIN msts tb2 on tbl1.j = tbl2.j and tbl1.s = tbl2.s
INNER JOIN tbl3 on tbl3.r = tbl1.j and tbl3.re = tbl1.s
AND tbl2.date > @EarliestDate
AND tbl2.date < @LatestDate
SELECT number3,number4
FROM table1 ci
WHERE 1=1
AND ci.number1 + CONVERT(varchar(5),ci.number2) IN (**@List**)
解决方法
要正确使用in()
,您必须指定一个查询,而不仅仅是放置声明的表变量并将数据插入其中。
示例:
DECLARE @EarliestDate date Set @EarliestDate = '2020-01-01'
DECLARE @LatestDate date Set @LatestDate = '2020-01-05'
DECLARE @List TABLE(DATAPOINT varchar(20))
INSERT INTO @List SELECT number1 + CONVERT(varchar(5),number2)
FROM
tbl1
INNER JOIN msts tb2 on tbl1.j = tbl2.j and tbl1.s = tbl2.s
INNER JOIN tbl3 on tbl3.r = tbl1.j and tbl3.re = tbl1.s
AND tbl2.date > @EarliestDate
AND tbl2.date < @LatestDate
SELECT number3,number4
FROM table1 ci
WHERE 1=1
AND ci.number1 + CONVERT(varchar(5),ci.number2) IN (select DATAPOINT from @List)
,
为了完整起见,您还可以使用CTE解决此问题-有时速度更快。我在这里也使用了连接,因为它有时也可以让编译器进行优化。
DECLARE @EarliestDate date Set @EarliestDate = '2020-01-01';
DECLARE @LatestDate date Set @LatestDate = '2020-01-05';
WITH list AS
(
SELECT number1 + CONVERT(varchar(5),number2) as DATAPOINT
FROM tbl1
JOIN msts tb2 on tbl1.j = tbl2.j and tbl1.s = tbl2.s
JOIN tbl3 on tbl3.r = tbl1.j and tbl3.re = tbl1.s
AND tbl2.date > @EarliestDate
AND tbl2.date < @LatestDate
)
SELECT number3,number4
FROM table1 ci
JOIN list on ci.number1 + CONVERT(varchar(5),ci.number2) = DATAPOINT ;
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