MYSQL从两个不同表的列中不存在id的表中检索数据

Question

What is the right syntax for something like this:

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

I'll appreciate any help.

Answer 1

Must be:

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

Try this:

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