常用sql语句(不定时更新)
--查询数据库所有表名与表说明
select a.name tableName, b.value tableComment from sysobjects a LEFT JOIN sys.extended_properties b ON a.id = b.major_id AND b.minor_id = 0 where xtype = 'u' order by tableName
--查询表的字段名,及对应的字段说明
select a.name tabname,a1.name '字段',b.value '字段描述(说明)' from sysobjects a left join sys.columns a1 on a.id = a1.object_id left join sys.extended_properties b on b.major_id = a.id and b.minor_id = a1.column_id where a.name='tb_Company'
--可用于导出表结构到EXCEL
SELECT 表名 = CASE WHEN A.COLORDER=1 THEN D.NAME ELSE '' END, 表备注 = CASE WHEN A.COLORDER=1 THEN ISNULL(F.VALUE,'') ELSE '' END, 列序号 = A.COLORDER, 列名称 = A.NAME, 标识 = CASE WHEN COLUMNPROPERTY(A.ID,A.NAME,'ISIDENTITY')=1 THEN '√ ' ELSE '' END, 主键 = CASE WHEN EXISTS(SELECT 1 FROM SYSOBJECTS WHERE XTYPE='PK' AND PARENT_OBJ=A.ID AND NAME IN ( SELECT NAME FROM SYSINDEXES WHERE INDID IN( SELECT INDID FROM SYSINDEXKEYS WHERE ID=A.ID AND COLID=A.COLID))) THEN '√' ELSE '' END, 类型 = B.NAME, 字节 = A.LENGTH, 长度 = COLUMNPROPERTY(A.ID,A.NAME,'PRECISION'), 小数位 = ISNULL(COLUMNPROPERTY(A.ID,A.NAME,'SCALE'),0), 允许空 = CASE WHEN A.ISNULLABLE=1 THEN '√ 'ELSE '' END, 默认值 = ISNULL(E.TEXT,''), 列备注 = ISNULL(G.[VALUE],'') FROM SYSCOLUMNS A LEFT JOIN SYSTYPES B ON A.XUSERTYPE=B.XUSERTYPE INNER JOIN SYSOBJECTS D ON A.ID=D.ID AND D.XTYPE='U ' --AND D.NAME<>'DTPROPERTIES' LEFT JOIN SYSCOMMENTS E ON A.CDEFAULT=E.ID LEFT JOIN sys.extended_properties G ON A.ID=G.major_id AND A.COLID=G.minor_id LEFT JOIN sys.extended_properties F ON D.ID=F.major_id AND F.minor_id=0 --where D.NAME='tbname' --查询这个表 ORDER BY A.ID,A.COLORDER
--分页查询
1 SELECT * FROM tb_ContractBase where c_isok=1 order by ID desc offset 0 rows fetch next 500 rows only 2 select * from (select *,ROW_NUMBER() over(order by id desc) ROW_ID from tb_ContractBase where c_isok=1) t where t.ROW_ID between 0 and 500
--update select
1 UPDATE A SET A1 = B1, A2 = B2, A3 = B3 FROM A, B WHERE A.ID = B.ID 2 UPDATE A SET A1 = B1, A2 = B2, A3 = B3 FROM A LEFT JOIN B ON A.ID = B.ID
问题:在同一个sql中,将一个数据库test后新建一个数据库覆盖还原,待还原成功的时候,test数据库一直显示“正在还原”。 在这种状态下,由于未提交的事务没有回滚,导致数据库不可以访问。
解决:执行查询restore database XXX with recovery后正常
无法用排他锁锁定该数据库,以执行该操作
原因是因为其他的线程占用这SqlServer的连接,可通过SQL查看
1 select spid from master.dbo.sysprocesses where dbid=db_id('databaseName')
采用SQL杀死占用方
1 kill spid
记得切换为别的别的数据库,要不然本身会占用一个连接,还杀不掉。再次重命名成功