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Create Table commentmeta(comment_id INT, meta_key VARCHAR(50), meta_value VARCHAR(50)); Insert Into commentmeta Values (540,'Voting','Great'), (540,'Country','UK'), (560,'Voting','Great'), (560,'Country','PL'), (610,'Voting','Bad'), (610,'Country','UK'), (630,'Voting','Great'), (630,'Country','UK');
Select T.meta_value As Country, COUNT(Case When D.meta_value = 'Great' Then 1 End) As Result From ( Select comment_id, meta_value From commentmeta Where meta_key = 'Country' ) T Join commentmeta D On T.comment_id = D.comment_id Where D.meta_key = 'Voting' Group By T.meta_value
Country
Result
UK
2
PL
1
Select COUNT(*) Reslut From commentmeta T Where T.meta_value = 'Great' And comment_id in (Select D.comment_id From commentmeta D Where D.meta_value = 'UK')
Reslut
2