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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