What are the more practical SQL statements?
This article mainly introduces "what are the more practical SQL sentences". In daily operation, I believe many people have doubts about the more practical SQL sentences. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubts of "what are the more practical SQL sentences?" Next, please follow the editor to study!
Id name
1 a
2 b
3 c
1 a
2 b
3 c
The following sql statements are subject to mytable in the above table:
1. Query all data recorded by id=1,3 select * from mytable
Where id in (1pr 3)
2. Delete the duplicated data of id. Only all data of id=1,2,3 is left in the table select * into # from mytable
Truncate table mytable
Insert table select distinct * from #
Select * from table
Drop table #
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