Delete data from SQL Tables

Question

I have 10 tables , say Table_1,Table_2,Table_3,Table_4 ...,Table_10.. I have to delete data from all the tables except Table_4. Is there any single line query to do it.(Using 'LIKE','IN' etc) "Delete * from tablename like Table_ where Table NOT IN ('Table_4')"..

Answer 1

If the number of tables exceeds 10, you don't want to list all tables in the delete statement. You should stick to the catalog and use a cursor:

declare @table nvarchar(max)
delcare @cur cursor

set @cur = cursor fast_forward for
  select name
  from sys.tables
  where name like 'Table_%'
  and name not like 'Table_4'

open @cur
fetch next from @cur into @table

while(@@fetch_status = 0)
begin
  sp_executesql 'DELETE FROM ' + @table

  fetch next from @cur into @table

end
close @cur
deallocate @cur

---

Edit: this answer is for MS SQL only :)

Answer 2

use [db_name]

declare @sql nvarchar(max)

select @SQL = 
(select ';
DELETE FROM ' + quotename(TABLE_SCHEMA) + '.' + 
quotename(TABLE_NAME) from INFORMATION_SCHEMA.TABLES where TABLE_TYPE = 'BASE TABLE'
and TABLE_NAME not in ('mytab1', 'mytab2')

ORDER BY Table_Schema, TABLE_NAME
FOR XML PATH(''), type).value ('.','nvarchar(max)')

print @SQL -- verify

It will create query for delete and use this query delete the table u required and skip u not required.

Answer 3

用Table_4编写删除查询

delete from Table_1,Table_2,Table_3,Table_5,......Table10