MYSQL從兩個不同表的列中不存在id的表中檢索數據

Question

像這樣的正確語法是什么：

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

我將不勝感激。

Answer 1

一定是：

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
         ^^^^

Answer 2

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

Answer 3

嘗試這個：

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