select top n * from table order by newid()
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select top n * from table order by newid()
select top n * from table order by newid()
newid()函式將建立乙個 uniqueidentifier 型別的唯一值。上面的語句實現效果是從table中隨機讀取n條記錄。
access：
select top n * from table order by rnd(id)
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select top n * from table order by rnd(id)
select top n * from table order by rnd(id)
rnd(id) 其中的id是自動編號字段，可以利用其他任何數值來完成，比如用姓名字段(username)
select top n * from table order by rnd(len(username))
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select top n * from table order by rnd(len(username))
select top n * from table order by rnd(len(username))
mysql：
select * from table order by rand() limit 10
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select * from table order by rand() limit 10
select * from table order by rand() limit 10
postgresql：
select * from glxt022 order by random() limit 5
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select * from glxt022 order by random() limit 5
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