sql - Need assistance understanding pivot table -


apologies pleading title!

i have following query need pivot:

select name, flag,count(*) [thecount] vwpopulationinformation group name, flag

a sample of returns is:

name    flag    thecount clea    1       309 clea    0       2 dms     1       18 dms     null    34 emid    1       392 emid    null    436 emid    0       45 emidn   0       1 emidn   1       167 emidn   null    31

...and need pivot return

name    yes no  ?   total clea    309 0   0   309 dms     18  0   34  52 emid    392 45  436 873 emidn   167 1   31  199

where flag field bit , needs translated to: 1 = 'yes', 0 = 'no', , null = '?'

i've looked @ pivot table examples can't head around it. can please?

you did not specify database using since mentioned pivot, assuming sql server. use:

select name,   coalesce(yes, 0) yes,   coalesce(no, 0) no,   coalesce([?], 0) [?],   coalesce(yes, 0) + coalesce(no, 0) + coalesce([?], 0) total (   select name,      case        when flag = 1 'yes'        when flag = 0 'no'       when flag null '?' end flag,     thecount   vwpopulationinformation ) src pivot (   sum(thecount)   flag in (yes, no, [?]) ) piv;

see sql fiddle demo


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