تبلیغات
SQL - union

union

نویسنده :tamishan tamishan1
تاریخ:چهارشنبه 13 دی 1391-10:11 ق.ظ

دستور Union:این دستور،اجتماع میگیرد و سطرهای تکراری را حذف می کند.

SELECT TOP 3

ID,

FirstName,

LastName

FORM

Students

Union

SELECT TOP 3

ID,

FirstName,

LastName

FORM

Students

تعداد و نوع ستون ها باید یکی باشد.در دستورUnion میتوان 3 تا SELECT را باهم بگیریم.تفاضل((excpt،اشتراک(intersect) و ادغام(merge) مانند دستور Union است.این دستورات بین دو SELECT قرار میگیرد. میتوانیم یک SUB Qeryبگیریم و به عنوان منبع به حساب می آوریم.




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