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MSSQL 多字段根据范围求最大值实现方法(mysql多字段数据)
编辑：rootadmin-->Title:生成?y????BR>-->Author:wufeng-->Date :-- ::declare @T table([Col1] int,[Col2] int,[Col3] int,[Col4] int,[Col5] int,[Col6] int,[Col7] int)Insert @Tselect 1,,,,,, union allselect 2,,,,,, union allselect 3,,,,,,--方法1select [col1], max([col2])maxcolfrom (select [col1],[col2] from @t union all select [col1],[col3] from @t union all select [col1],[col4] from @t union all select [col1],[col5] from @t union all select [col1],[col6] from @t union all select [col1],[col7] from @t )Twhere [col2] between and --?l件限制group by [col1]/*col1 maxcol----------- -----------1
(3 ???料列受到影?)
*/--方法2select [col1], (select max([col2])from ( select [col2] union all select [col3] union all select [col4] union all select [col5] union all select [col6] union all select [col7] )T where [col2] between and ) as maxcol --指定查????BR>from @t/*(3 ???料列受到影?)col1 maxcol----------- -----------1 */
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