PostgreSQL如何判断字段是否存在
方法一：
select count(*) from information_schema.columns WHERE table_schema = 'table_schema' and table_name = 'table_name' and column_name = 'column_name';
方法二：
select * from information_schema.columns WHERE table_schema = 'table_schema' and table_name = 'table_name' and column_name = 'column_name';
补充：
判断表是否存在：
select count (*) from information_schema.tables WHERE table_schema = 'table_schema' and table_name = 'table_name'; select * from information_schema.tables WHERE table_schema = 'table_schema' and table_name = 'table_name';
推荐：postgresql教程
神龙|纯净稳定代理IP免费测试>>>>>>>>天启|企业级代理IP免费测试>>>>>>>>IPIPGO|全球住宅代理IP免费测试
