database - How to nested SQL Queries? - 


select id, (select top 1 content id=id(in table a) b) content

i want query data table base on id in each of a, , query other data id @ same time, transfer new column.

anybody know how it?

sounds want correlated query, can (example sql server, based on usage of top n):

select      a.id,              (select top 1                         content                     b                   b.id = a.id             ) content

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