Php MYSQL从两个不同表的列中不存在id的表中检索数据

以下内容的正确语法是什么：

SELECT * FROM gals 
WHERE id NOT IN (SELECT id_gal FROM paginas_principales)
     AND id NOT IN (SELECT id_gal FROM paginas_secundarias)

我将感谢您的帮助。

必须：

SELECT * FROM gals 
WHERE id NOT IN (SELECT id_gal FROM paginas_principales)
     AND id NOT IN (SELECT id_gal FROM paginas_secundarias) ORDER BY id DESC
         ^^^^

试试这个：

SELECT * FROM gals g,(SELECT id_gal FROM paginas_principales)t 
WHERE g.id !=t.id_gal 
     AND g.$whateveryourcolumn !=t.id_gal ORDER BY id DESC

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结尾的问号可能是问题的一部分，而不是代码块的一部分？除了下面的答案，结尾的双引号也应该删除。谢谢你的回答。没错，问号不是代码块的一部分。对不起，我犯了那个错误。这是我第一次在这里回答。你似乎错过了问题中提到的一张桌子。

SELECT * FROM gal LEFT JOIN primary ON gal.id_gal = primary.id_gal LEFT JOIN secondary ON gal.id_gal = secondary.id_gal WHERE primary.id_gal IS NULL AND secondary.id_gal IS NULL