if statement - DB2 SQL filter query result by evaluating an ID which has two types of entries -

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after many attempts have failed @ , hoping can help. query returns every entry user makes when items made in factory against , order number. example

order number   entry type  quantity 3000          1           1000 3000          1           500 3000          2           300 3000          2           100 4000          2           1000 5000          1           1000

what want query return filter results this

if order number has entry type 1 , 2 return row type 1 otherwise return row whatever type order number.

so above end up:

order number   entry type  quantity 3000          1           1000 3000          1           500 4000          2           1000 5000          1           1000

currently query (db2, in basic terms looks ) , correct until change request came through!

select * bookings type=1 or type=2

thanks!

select * bookings     left outer join (        select order_number,           max(case when type=1 1 else 0 end) +               max(case when type=2 1 else 0 end) type_1_and_2           bookings           group order_number     ) has_1_and_2 on         type_1_and_2 = 2        has_1_and_2.order_number = bookings.order_number              bookings.type = 1 or          has_1_and_2.order_number null

find orders have both type 1 , type 2, , join it.

if row matched join, return if type 1 if row did not match join (has_type_2.order_number null) return no matter type is.


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