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DECLARE @x VARCHAR(10); DECLARE @y INT; DECLARE @z VARCHAR(10); SET @x = ‘1000‘; SET @y = ‘2000‘; SET @z = ‘+3000‘;
--第一种
SELECT CASE WHEN @x < @y THEN ‘TRUE‘ ELSE ‘FALSE‘ END AS [x<y?], CASE WHEN @y < @z THEN ‘TRUE‘ ELSE ‘FALSE‘ END AS [y<z?], CASE WHEN @x < @z THEN ‘TRUE‘ ELSE ‘FALSE‘ END AS [x<z?]
结果为
x<y? y<z? x<z?
TRUE TRUE FALSE
第二种
SELECT
CASE WHEN @x < @y THEN ‘TRUE‘ ELSE ‘FALSE‘ END AS [CAST(x)<y?],
CASE WHEN @y < @z THEN ‘TRUE‘ ELSE ‘FALSE‘ END AS [y<CAST(z)?],
CASE WHEN @x < @z THEN ‘TRUE‘ ELSE ‘FALSE‘ END AS [x<z?],
CASE WHEN CAST(@x AS INT) < CAST(@z AS INT)
THEN ‘TRUE‘ ELSE ‘FALSE‘ END AS [CAST(x)<CAST(z)?]
结果为
CAST(x)<y? y<CAST(z)? x<z? CAST(x)<CAST(z)?
TRUE TRUE FALSE TRUE
ＳＱＬ技术内幕－7 varchar类型的数字和 int 类型的数字的比较+cast的适用
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原文地址：http://www.cnblogs.com/alphafly/p/4307258.html
