sql - LEFT join returns only NULL for right side -


i facing problem join query 2 conditions. problem query gives left site, whereas right site contains null. checked types of data match. going wrong?

select t2.year_number     ,t2.week_number     ,t2.stock_ric     ,t1.sent_pos_weighted     ,t1.sent_neut_weighted     ,t1.sent_neg_weighted     ,t1.observations     ,t1.av_w_relevance     ,t1.av_w_lnkd_cnt1     ,t1.av_w_item_cnt1 res structure2016 t2 left join      pre t1      on t1.week_number = t2.week_number , t1.stock_ric = t2.stock_ric order stock_ric, week_number

edit: brief example of how tables , should like. stock_ric columns of type char(13)

    table structure2016:      stock_ric       year   week_number     jpm.n           2016    1     jpm.n           2016    2     jpm.n           2016    3        table pre:     stock_ric    week_number  sent_pos_weighted     jpm.n           5             0.1     jpm.n           3             0.9     jpm.n           1             0.1     jpm.n           10            0.1      result should     stock_ric        week_number  sent_pos_weighted     jpm.n               1              0.1     jpm.n               2              null     jpm.n               3              0.9

it should work fine, constructed sample provided , here result

stock_ric   week_number sent_pos_weighted jpm.n         1               0.1 jpm.n         2               null jpm.n         3               0.9

the code used 

declare @table table(      stock_ric varchar(10),      year int,      week_number int   )  declare @pre table(     stock_ric varchar(10),     week_number int,     sent_pos_weighted decimal(3,1)   )    insert @table(stock_ric,year,week_number)   select 'jpm.n',2016,1   union   select 'jpm.n',2016,2   union   select 'jpm.n',2016,3     insert @pre(stock_ric,week_number,sent_pos_weighted)   select 'jpm.n',5,0.1   union   select 'jpm.n',3,0.9   union   select 'jpm.n',1,0.1   union   select 'jpm.n',10 ,0.1     select t.stock_ric,t.week_number,p.sent_pos_weighted   @table t   left join @pre p on t.stock_ric = p.stock_ric , t.week_number = p.week_number

it seems problem not in code posted


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