mysql - SQL Select Query between 3 tables -


i'm having trouble on creating query pull data 3 tables.

i have job_skus table, skus table, , stage table, , i'm trying select job skus whole month regardless of jobno, example show list of job skus month of april.

the tables' structure 

job_sku                             example data   jobno                             j4454             j4454   sku (refences product.sku)        93339             9947   quantity                          500               600   stage                             1                 2  products    sku(primary key)                 93339             9947    description                      galvanised nails  steel rods 900mm  stage  jobno                              j4454             j4454  stage                              1                 2  date                               04/04/2015        12/04/2015

and on.

i have come query

select jm.sku,jm.quantity,p.description  stage s, products p, job_sku jm  s.date between '2015-04-01' , '2015-04-30'  , jm.stage = s.stage , p.sku = jm.sku

but seems getting duplicate data in query. need use join of sort, or maybe extract stages date period , join result onto job_sku table?

here's 1 suggestion. others in thread have suggested distinct result in same thing, using exists predicate clarifies intention of query (imo):

select jm.sku      , jm.quantity      , p.description   products p join  job_sku jm     on p.sku = jm.sku exists (     select 1     stage s     s.date between '2015-04-01' , '2015-04-30'        , jm.stage = s.stage );

as others have mentioned, ansi joins make query bit easier understand. vendors continue support "," join long live, code wont break, ansi join make easier maintain.


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