实用的T_sql语句收藏（持续更新）

 

1.记录分组叠加

select c_GId,c_Id from t_Cargo 
where c_GId in ('MH-C2970','MX-B0794')

查询结果：

 

 

select b.c_GId,LEFT(b.CargoList,len(b.CargoList)-1) from 
 (
    select a.c_GId,
    (
      select c_Id + ';' from t_Cargo
      where c_GId=a.c_GId
       for xml path('')
     ) as CargoList
    from t_Cargo a
    where a.c_GId in ('MH-C2970','MX-B0794')
    group by a.c_GId
  )
b 

查询结果：

 --查询各表中的索引

      SELECT 

      d.name 表名,

       c.name 索引名称,

       b.name 索引字段,

      CASE  c.type  WHEN '1' THEN '聚集'

                            WHEN '2' THEN '非聚集'

                            END AS 索引类型

                            ,

       c.is_unique 是否唯一

         from sys.index_columns a

      LEFT JOIN sys.columns b

      ON (a.column_id=b.column_id AND a.object_id=b.object_id)

      LEFT JOIN sys.indexes c

      ON (a.index_id=c.index_id AND a.object_id=c.object_id)

      LEFT JOIN sys.tables d

      ON a.object_id=d.object_id

      WHERE d.object_id=object_id('guest')

--用not in的视图和存储过程

SELECT a.NAME,b.definition,

CASE WHEN   a.xtype='v' THEN  '视图' 

     WHEN a.xtype='p' THEN '存储过程'

      ELSE '其他'

       END AS 类型 

 from  sysobjects  a

LEFT JOIN sys.all_sql_modules b

ON a.id=b.object_id

WHERE a.xtype IN ('v','p')

AND CHARINDEX('not in', b.definition,0) >0 

ORDER BY 类型  DESC