database - SQL Subquery to get first record -


i need execute query below.

select to_char(rownum), a.name, b.order, (select * ( select round(last_order_amount,5) orders id=a.id , request_level='n' order o_date desc) rownum =1) amount table1 left join table2 b on a.type_code = b.entity_type

but gives me a.id invalid error in oracle. need first record inner query return multiple records.

can please let me know how can bind these tables achieve goal.

thank in advance.

you can rewrite subquery using with clause, not sure on syntax should following.

with    amountquery       (            select id                ,round(last_order_amount, 5) amountvalue                ,row_number() on ( order o_date desc ) rn             orders             request_level = 'n'          ) select to_char(rownum)        ,a.name        ,b.order        ,c.amountvalue     table1     left join table2 b         on a.type_code = b.entity_type     left join amountquery c         on a.id = c.id            , c.rn = 1

here sqlfiddle show how works.

http://sqlfiddle.com/#!4/696b6/36


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