if exitst tablename then drop ... 好像是这么写、记不清了、自己生成一个表的脚本在查询分析器里打开一看就知道了
select * from systable where tablename=mytabledrop thistalbeselect * from systalbe如果是sql server就写个procedureCREATE PROCEDURE selectanddeltable @tablenames varchar(20) ASdeclare @thistalbe varchar(20) declare @ExeSQL varchar(50)select @thistable=name from sysobject where name=@tablenameif @thistalbe!='' begin @exesql='drop ' + @thistalbe execute @exesql endSELECT * FROM sysobjects WHERE xtype = 'U' go///你要用RecordSet来执行,不然不会返回表名
1. IF EXISTS(SELECT * FROM sysobjects WHERE XTYPE = 'U' AND NAME = 'CAL_ACCOUNT_ORDER') BEGIN DROP TABLE CAL_ACCOUNT_ORDER END 2.SELECT * FROM sysobjects WHERE XTYPE = 'U'
1. IF EXISTS(SELECT * FROM sysobjects WHERE XTYPE = 'U' AND NAME = 'CAL_ACCOUNT_ORDER') BEGIN DROP TABLE CAL_ACCOUNT_ORDER END 或者: if object_id('cal_account_order') is not null drop table cal_account_order 2.SELECT * FROM sysobjects WHERE XTYPE = 'U'
在SQL数据库里,点右键,选生成SQL脚本,那里就有。
zt -- ======================================================--列出SQL SERVER 所有表,字段名,主键,类型,长度,小数位数等信息--在查询分析器里运行即可,可以生成一个表,导出到EXCEL中-- ======================================================SELECT (case when a.colorder=1 then d.name else '' end)表名, a.colorder 字段序号, a.name 字段名, (case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '√'else '' end) 标识, (case when (SELECT count(*) FROM sysobjects WHERE (name in (SELECT name FROM sysindexes WHERE (id = a.id) AND (indid in (SELECT indid FROM sysindexkeys WHERE (id = a.id) AND (colid in (SELECT colid FROM syscolumns WHERE (id = a.id) AND (name = a.name))))))) AND (xtype = 'PK'))>0 then '√' else '' end) 主键, b.name 类型, a.length 占用字节数, COLUMNPROPERTY(a.id,a.name,'PRECISION') as 长度, isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0) as 小数位数, (case when a.isnullable=1 then '√'else '' end) 允许空, isnull(e.text,'') 默认值, isnull(g.[value],'') AS 字段说明 FROM syscolumns a left join systypes b on a.xtype=b.xusertypeinner join sysobjects d on a.id=d.id and d.xtype='U' and d.name<>'dtproperties'left join syscomments eon a.cdefault=e.idleft join sysproperties gon a.id=g.id AND a.colid = g.smallid order by a.id,a.colorder-------------------------------------------------------------------------------------------------
好像是这么写、记不清了、自己生成一个表的脚本在查询分析器里打开一看就知道了
declare @ExeSQL varchar(50)select @thistable=name from sysobject where name=@tablenameif @thistalbe!=''
begin
@exesql='drop ' + @thistalbe
execute @exesql
endSELECT * FROM sysobjects WHERE xtype = 'U'
go///你要用RecordSet来执行,不然不会返回表名
IF EXISTS(SELECT * FROM sysobjects WHERE XTYPE = 'U' AND NAME = 'CAL_ACCOUNT_ORDER')
BEGIN
DROP TABLE CAL_ACCOUNT_ORDER
END
2.SELECT * FROM sysobjects WHERE XTYPE = 'U'
IF EXISTS(SELECT * FROM sysobjects WHERE XTYPE = 'U' AND NAME = 'CAL_ACCOUNT_ORDER')
BEGIN
DROP TABLE CAL_ACCOUNT_ORDER
END
或者:
if object_id('cal_account_order') is not null
drop table cal_account_order
2.SELECT * FROM sysobjects WHERE XTYPE = 'U'