数据库20060415.doc

SQL查看CHECK约束信息??????? 以下两个语句均基于系统表sysobjects、syscomments和系统视图sysconstraints，查询结果中包括表ID、表名、列ID、列名、CHECK约束ID、CHECK约束名、CHECK约束status值以及CHECK约束的内容，TCCView为Table-Column-Check View，结果中均为列级CHECK约束，TCView为Table-Check View，结果中均为表级CHECK约束。 ?????? 1.SELECT TOP 100 PERCENT a.id AS tableid, a.tablename, a.colid, a.columnname, ????? a.datatype, a.length, b.constid AS checkid, b.checkname, b.status, b.contentFROM (SELECT sysobjects.name AS tablename, sysobjects.id, ????????????? syscolumns.name AS columnname, syscolumns.colid, ????????????? systypes.name AS datatype, syscolumns.length AS length??????? FROM sysobjects, syscolumns, systypes??????? WHERE sysobjects.xtype = u AND sysobjects.id = syscolumns.id AND ????????????? syscolumns.xtype = systypes.xtype AND ????????????? systypes.xtype = systypes.xusertype AND sysobjects.status 0) ????? a LEFT OUTER JOIN????????? (SELECT sysobjects.name checkname, sysobjects.status, sysconstraints.constid, ?????????????? sysconstraints.id, sysconstraints.colid, syscomments.text AS content???????? FROM sysobjects, sysconstraints, syscomments???????? WHERE xtype = c AND sysobjects.id = sysconstraints.constid AND ?????????????? sysconstraints.constid = syscomments.id) b ON a.id = b.id AND ????? a.colid = b.colidORDER BY a.tablename, a.columnname, b.checkname??? ???? 2.SELECT a.id AS tableid, a.tablename, b.constid AS checkid, b.checkname, b.status, ????? b.contentFROM (SELECT sysobjects.id, sysobjects.name AS tablename??????? FROM sysobjects??????? WHERE sysobjects.xtype = u AND sysobjects.status 0) a LEFT OUTER JOIN????????? (SELECT sysobjects.name checkname, sysobjects.status, sysconstraints.constid, ?????????????? sysconstraints.id, sysconstraints.colid, syscomments.text AS content???????? FROM sysobjects, sysconstraints, syscomments???????? WHERE xtype = c AND sysobjects.id = sysconstraints.constid AND ?????????????? sysconstraints.constid = syscomments.id AND sysconstraints.colid = 0) b ON ????? a.id = b.id ??