SQL 多條件查詢
以后我們做多條件查詢,一種是排列結(jié)合,另一種是動(dòng)態(tài)拼接SQL
如:我們要有兩個(gè)條件,一個(gè)日期@addDate,一個(gè)是@name
第一種寫法是
if (@addDate is not null) and (@name <> '')select * from table where addDate = @addDate and name = @nameelse if (@addDate is not null) and (@name ='')select * from table where addDate = @addDate else if(@addDate is null) and (@name <> '')select * from table where and name = @nameelse if(@addDate is null) and (@name = '')select * from table
第二種就是動(dòng)態(tài)組成SQL,通過(guò)exec來(lái)執(zhí)行，我就不寫，
昨天我想到一種辦法
select * from table where (addDate = @addDate or @addDate is null) and (name = @name or @name = '')
結(jié)果一調(diào)試，成功，
一點(diǎn)想法，有更好方法的，請(qǐng)指教！～
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