php - SELECT * FROM table where id is in other table -

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i have 2 tables:

items_table

item    id item1   1 item2   3 item3   2 item4   1 item5   3

colors_table

id  color 1   red 2   green 3   blue

how can select items items_table color = blue?

i think should use join don't know how use.

can me, please?

try this: 

select *  items_table  join colors_table ct on it. id = ct.id ct.color = "blue"

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