--use tables of another database select * from master.dbo.sysmessages select * from master..sysmessages
--create a new table which has another table‘s structure select * into target_table from source_table where 0=1
--to see a table or procedure existing or not IF exists(select name from sysobjects where name=‘tablename‘ and type=‘U‘)
-- insert into target_table select * from source_table
--define output parameter and set default value @affect_rows integer=0 output
--use procedure create procedure up_test @out_val integer=0 output as begin set @out_val=1 return 9; end
declare @ret_val int declare @output_val int exec @ret_val=up_test @out_val=@output_val output select @ret_val,@output_val
--use transaction begin tran delete from tablename if @@error<>0 begin rollback tran else commit tran
--define cursor declare cur_tablename cursor FORWARD_ONLY | SCROLL for select * from tablename for update [OF column_name [,...n]]
update tablename set column_name=‘r‘ where current of cur_tablename
--format string ‘050330‘ as ‘2005-03-30‘ select ‘20‘+SubString(‘050330‘,1,2) +‘-‘+ SubString(‘050330‘,3,2) +‘-‘+ SubString(‘050330‘,5,2)
--字段AA為字符型﹐它的內容為X+Y+Z。其中X和Z都為任意個字母字符﹐Y為任意個數字字符 --現我要得到X+Y﹐即去掉后而的Z。for example:‘BR0021GD ‘-->‘BR0021‘ reverse(substring(reverse(AA),patindex(‘%[^0-9]%‘,reverse(AA)),len(AA)) replace(AA,right(AA,patindex(‘%[0-9]%‘,reverse(AA))),‘‘)
--using variable as tablename(partly or fully) declare @tablename varchar(20) set @tablename=‘ment‘ if EXISTS (SELECT name FROM sysobjects WHERE name = ‘depart‘+@tablename AND type = ‘U‘) begin print ‘table department exists‘ exec(‘selcect * from depart‘+@tablename) end else print ‘table department donot exists‘
--显示文章、提交人和最后回复时间 select a.title,a.username,b.adddate from table a,(select max(adddate) adddate from table where table.title=a.title) b
--一个表中的Id有多个记录,把所有这个id的记录查出来,并显示共有多少条记录数。 select d_id,count(*) from department group by d_id WITH ROLLUP select d_id, Count(*) from department group by d_id compute count(d_id)
--add check constraint alter table people add constraint ccme_people_sex check (p_sex=‘m‘ or p_sex=‘w‘); alter table people add constraint ccme_people_birthday check(p_birthday is null or p_birthday like ‘[0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9]‘); alter table people with nocheck add constraint cfme_people_dept foreign key(p_dept) references department(d_id);
--use case select p_familyname+p_firstname as ‘姓名‘, case p_sex when ‘m‘ then ‘男‘ when ‘w‘ then ‘女‘ end as ‘性别‘ from tablename
--import_date is smalldatetime,type as yyyy-mm-dd convert(varchar(10),import_date,20) convert(varchar(10),import_date,121)
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