sql - Query that looks for contract status in another table and flags accordingly -


i have following 2 tables:

              table    contract number     other field        1                            2                     b        3                     c        4                     d        …                     …                          table b       contract number     contract status     date of contract status         1              status-1                1/1/2016         1              status-2                1/2/2016         1              status-3                1/3/2016         2              status-1                1/1/2016         2              status-3                1/2/2016         2              status-4                1/3/2016         2              status-5                1/4/2016         3              status-1                1/1/2016         3              status-2                1/2/2016         4              status-3                1/1/2016         4              status-4                1/2/2016         4              status-5                1/3/2016         4              status-6                1/4/2016         4              status-7                1/5/2016         4              stauts-8                1/6/2016         …                 …                       …

i trying write query retrieves "contract number" , "some other field" table a. additionally, want have third field in query should show 1 if "status-2" found contract number in "contract status" of table b , 0 otherwise.

what managed far:

flag: iif(table b.contract stauts='status-2',1,0)

i used code field should show either 1 or 0. however, unable include in query. guess need kind of loop, such each record retrieved table a, loop searches table b "status-2".

the desired result this:

              query result   contract number     other field      flag        1                                 1        2                     b             0        3                     c             1        4                     d             0        …                     …             ...

can guys advise? lot!

if understood correctly, need this:

select t.contract_number,        t.someother,        iif(exists(select 1 tableb p                         p.contract_number = t.contract_number , p.contract_status = 'status-2'),1,0) flag_col tablea t

for each contract_number, if status-2 exists in other table, put 1 else 0


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