sql server - T-SQL IF statement embedded in a sum() function -


i'm attempting convert mysql query t-sql query , if statement that's enclosed within sum statement tripping me up. suggestions?

select     cmts_rq.[dated],     cmts_rq.cmts_name,     count(cmts_rq.cmts_name) emat_count,     sum(if(cmts_rq.us_pwr>=37 , cmts_rq.us_pwr<=49)) us_pwr_good     cmts_rq group     cmts_rq.cmts_name,     cmts_rq.[dated]

but error:

msg 156, level 15, state 1, line 5
incorrect syntax near keyword 'if'.
msg 102, level 15, state 1, line 5
incorrect syntax near ')'.

t-sql doesn't have "inline" if statement - use case instead:

select     cmts_rq.[dated],     cmts_rq.cmts_name,     count(cmts_rq.cmts_name) emat_count,     sum(case             when cmts_rq.us_pwr >=37 , cmts_rq.us_pwr <= 49               1              else 0          end) us_pwr_good     cmts_rq group     cmts_rq.cmts_name,     cmts_rq.[dated]

so if value of cmts_rq.us_pwr >= 37 , <= 49 add 1 sum - otherwise 0. give you're looking for?

in sql server 2012 , newer, can use new iif function:

sum(iif(cmts_rq.us_pwr >= 37 , cmts_rq.us_pwr <= 49, 1, 0)) us_pwr_good

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