的MySQL數查詢

Question

我有一個MySQL表中設置了這樣

id | refference_id | data 

是否有可能算的條目數每個查詢refference_id呢？

Answer 1

SELECT 
    refference_id, 
    COUNT(*) 
FROM 
    table 
GROUP BY 
    refference_id 

Answer 2

select count（distinct refference_id）as myResult from myTable;