Question

我需要编写sql查询来检查表x中的列y是否有值。在python中，我可以像

一样检查

object.y = 1
if object.y:
   <statements>

像这样我需要检查Postgres

这是我的疑问：

request.cr.execute(""" select * from x where parent_id = %s and nav_include = true and website_published = true and cms_lang = NULL and y is TRUE order by sequence""",([event_root]))

这里我需要检查y是否有值。

Answer 1

试试这个

request.cr.execute(""" select * from x where parent_id = %s and nav_include = true and website_published = true and cms_lang = NULL and coalesce(y, FALSE) is TRUE order by sequence""",([event_root]))

Answer 2

这是我已经解决的答案

request.cr.execute(""" select * from x where parent_id = %s and nav_include = true and website_published = true and cms_lang is NULL and y is not null order by sequence""",([event_root]))

参考：https://www.techonthenet.com/postgresql/is_not_null.php

IF列有一个值

2 个答案: