用SQL语句获得PostgreSQL表的主键

select pg_constraint.conname as pk_name from pg_constraint inner join pg_class
on pg_constraint.conrelid = pg_class.oid where pg_class.relname = 'yourtablename' and pg_constraint.contype='p'

这个可以显示yourtablename表的主键

select pg_constraint.conname as pk_name,pg_attribute.attname as colname,pg_type.typname as typename from
pg_constraint inner join pg_class
on pg_constraint.conrelid = pg_class.oid
inner join pg_attribute on pg_attribute.attrelid = pg_class.oid
and pg_attribute.attnum = pg_constraint.conkey[1]
inner join pg_type on pg_type.oid = pg_attribute.atttypid
where pg_class.relname = 'yourtablename'
and pg_constraint.contype='p'

这个可以显示出主键名，和主键关联的字段名,和字段名类型

可以通过系统表来获取这些信息
什么数据库呢

你会用PLSQL Developer吗 你说的这些要求 这个工具能完成 直接右键点你的表 选择viwe 就可以清楚的看到你所需要的东西了 如果没有PLSQL Developer就按这个名字去网上下一个很小 安装很简单