SELECT
isnull(FKhmc) as FKhmc
FROM
x008
ORDER BY
fid DESC
LIMIT 2,1
执行上述查询返回一个没有内容的空表
select
(
SELECT
isnull(FKhmc) as FKhmc
FROM
x008
ORDER BY
fid DESC
LIMIT 2,1 )
as
查询结果
查询上述结果表，，查询结果会显示为(null)
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