SELECT FROM WHERE = true

Question

我正在尝试选择填写字段的数据库条目。数据库有两种插入数据的方式，一种输入注释，一种不输入，我期待只选择填写了注释的行。

 $requete = "SELECT * FROM daysoff WHERE comment = true ORDER BY id";

哪里出错了？或者这样做的正确方法是什么？

Answer 1

您可以尝试：

$requete = "SELECT * FROM daysoff WHERE comment IS NOT NULL ORDER BY id";

Answer 2

你必须尝试这个

$requete = "SELECT * FROM daysoff WHERE comment IS NOT NULL AND comment != '' ORDER BY id";