关于Oracle与SqlServer中获取所有字段、主键、外键的sql语句
--oracle:--查询某个表中的字段名称、类型、精度、长度、是否为空select COLUMN_NAME,DATA_TYPE,DATA_PRECISION,DATA_SCALE,NULLABLE from user_tab_columns where table_name ='YourTableName'--查询某个表中的主键字段名select col.column_name from user_constraints con,user_cons_columns col where con.constraint_name = col.constraint_name and con.constraint_type='P' and col.table_name = 'YourTableName'--查询某个表中的外键字段名称、所引用表名、所应用字段名select distinct(col.column_name),r.table_name,r.column_name from user_constraints con,user_cons_columns col, (select t2.table_name,t2.column_name,t1.r_constraint_namefrom user_constraints t1,user_cons_columns t2where t1.r_constraint_name=t2.constraint_nameand t1.table_name='YourTableName' ) r where con.constraint_name=col.constraint_name and con.r_constraint_name=r.r_constraint_name and con.table_name='YourTableName' --SQLServer中的实现：--字段：SELECT c.name,t.name,c.xprec,c.xscale,c.isnullable FROM systypes t,syscolumns c WHERE t.xtype=c.xtype AND c.id = (SELECT id FROM sysobjects WHERE name='YourTableName') ORDER BY c.colid--主键（参考SqlServer系统存储过程sp_pkeys）：select COLUMN_NAME = convert(sysname,c.name) from sysindexes i, syscolumns c, sysobjects o where o.id = object_id('') and o.id = c.id and o.id = i.id and (i.status & 0x800) = 0x800 and (c.name = index_col ('', i.indid,1) or c.name = index_col ('', i.indid,2) or c.name = index_col ('', i.indid,3) or c.name = index_col ('', i.indid,4) or c.name = index_col ('', i.indid,5) or c.name = index_col ('', i.indid,6) or c.name = index_col ('', i.indid,7) or c.name = index_col ('', i.indid,8) or c.name = index_col ('', i.indid,9) or c.name = index_col ('', i.indid, 10) or c.name = index_col ('', i.indid, 11) or c.name = index_col ('', i.indid, 12) or c.name = index_col ('', i.indid, 13) or c.name = index_col ('', i.indid, 14) or c.name = index_col ('', i.indid, 15) or c.name = index_col ('', i.indid, 16) )--外键：select t1.name,t2.rtableName,t2.name from (select col.name, f.constid as tempfrom syscolumns col,sysforeignkeys fwhere f.fkeyid=col.idand f.fkey=col.colidand f.constid in( select distinct(id) from sysobjects where OBJECT_NAME(parent_obj)='YourTableName' and xtype='F' )) as t1 , (select OBJECT_NAME(f.rkeyid) as rtableName,col.name, f.constid as tempfrom syscolumns col,sysforeignkeys fwhere f.rkeyid=col.idand f.rkey=col.colidand f.constid in( select distinct(id) from sysobjects where OBJECT_NAME(parent_obj)='YourTableName' and xtype='F') ) as t2 where t1.temp=t2.temp
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