sql server 2012 - How to use Count for specific condition -


how can count , show how many opportunity have stage 3 dont have stage 2?

+-------+-------+ | oppid | stage | +-------+-------+ | abc   |     1 | | abc   |     2 | | abc   |     3 | | abc   |     4 | | cdf   |     3 | | cdf   |     4 | | efg   |     1 | | efg   |     2 | | efg   |     3 | | hij   |     2 | | hij   |     3 | | lmi   |     1 | | lmi   |     2 | | lmi   |     4 | +-------+-------+

the count result 1

+-------+-------+ | oppid | stage | +-------+-------+ | cdf   |     3 | | cdf   |     4 | +-------+-------+

got it, use not exists , count distinct in following:

select count(distinct oppid)  tbl t1 not exists (select 1 tbl t2 t1.oppid = t2.oppid , t2.stage = 2) , t1.stage = 3

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