下文为您介绍Oracle及SQL Server两种数据库中查询表主键外键信息的SQL语句写法，供您参考，希望对您学习SQL语句的使用有所启迪 。
Oracle:
- select o.obj# as objectId, o.name AS tableName, oc.name AS constraintName,
- decode(c.type#, 1, C, 2, P, 3, U,
- 4, R, 5, V, 6, O, 7,C, ?) as constraintType,
- col.name AS columnName
-
- from sys.con$ oc, sys.con$ rc,
- sys.obj$ ro,sys.obj$ o, sys.obj$ oi,
- sys.cdef$ c,
- sys.col$ col, sys.ccol$ cc, sys.attrcol$ ac
- where oc.con# = c.con#
- and c.obj# = o.obj#
- and c.rcon# = rc.con#(+)
- and c.enabled = oi.obj#(+)
- and c.robj# = ro.obj#(+)
- and c.type# != 8
- and c.type# != 12 /* dont include log groups */
-
- 字串9
-
- and c.con# = cc.con#
- and cc.obj# = col.obj#
- and cc.intcol# = col.intcol#
- and cc.obj# = o.obj#
- and col.obj# = ac.obj#(+)
- and col.intcol# = ac.intcol#(+)
- and o.name = your table
SQL Server:
- SELECT sysobjects.id objectId,
- OBJECT_NAME(sysobjects.parent_obj) tableName,
- sysobjects.name constraintName,
- sysobjects.xtype AS constraintType,
- syscolumns.name AS columnName
- FROM sysobjects INNER JOIN sysconstraints
- ON sysobjects.xtype in(C, F, PK, UQ, D)
- AND sysobjects.id = sysconstraints.constid
- LEFT OUTER JOIN syscolumns ON sysconstraints.id = syscolumns.id
- WHERE OBJECT_NAME(sysobjects.parent_obj)=your table
