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PostgreSQL如何判断字段是否存在
极客小将2021-01-01-
简介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'
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PostgreSQL如何判断字段是否存在tER少儿编程网-Scratch_Python_教程_免费儿童编程学习平台
方法一:
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方法二:tER少儿编程网-Scratch_Python_教程_免费儿童编程学习平台
select * from information_schema.columns WHERE table_schema = 'table_schema' and table_name = 'table_name' and column_name = 'column_name';补充:tER少儿编程网-Scratch_Python_教程_免费儿童编程学习平台
判断表是否存在:tER少儿编程网-Scratch_Python_教程_免费儿童编程学习平台
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tER少儿编程网-Scratch_Python_教程_免费儿童编程学习平台