SQL Server query replace for MySQL Instruction -

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i'm new sql server, , used mysql while now...

select a.acol, if(a.acol<0,"neg","pos") column2 table

i want on sql server, there doesn't exist if instruction.

how replace if, in sql server 2008 query?

select a.acol,      case when a.acol < 0 'neg' else 'pos' end column2  table

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