PostgreSQL如何判断字段是否存在
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';
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来源:PY学习网:原文地址:https://www.py.cn/article.html