sql - Merge data from different rows to different columns -

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this question has answer here:

i have table (t)

user | language | value ----------------------- 1    |1         | string 1    |2         | otherstring

and want merge/join them this

user | language_1 | language_2 -------------------------------- 1    |string      | otherstring

i tried this

select       user,              (case when language = 1 value end) language_1,              (case when language = 2 value end) language_2         t

but result (i should have expected this)

user | language_1 | language_2 -------------------------------- 1    |string      | null 1    |null        | otherstring

whats right way it?

you need aggregation 

select user,          max(case when language = 1 value end) language_1,          max(case when language = 2 value end) language_2  t group user

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