mysql - sql statement for two different columns -


i trying make sql query between 2 columns.

table_1

id     productname      productdescription 1      prod_1             description_1 2      prod_2             description_1 3      prod_3             description_1 4      prod_4             description_1 5      prod_5             description_1

table_2

id       product       partner 1          1              21 2          2              21 3          3              21 4          1              32           5          1              32               6          4              21               7          5              21 8          5              32

by using query below result list of products selected in table_2. need that, want print values table_1 in same query later programming need that. not sure possible make 1 column print 1 if product_id , id match , if not print 0

$query = "select a.id, a.productname, b.id, b.product, b.partner table_1 left join table_2 b on a.id = b.product b.partner = 21"

i want print values table_1 match table_2 selected in table_2. getting stuck here advice appreciated.

as right requirenments untested query should work:

$query = "select a.id, a.productname, b.id, b.product, b.partnerm, case when b.id null 0 else 1 end table_1 left join table_2 b on a.id = b.id , b.partner = 21"

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