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CREATE TABLE table_name( X VARCHAR(5), i INT ); INSERT INTO table_name VALUES ('A',1); INSERT INTO table_name VALUES ('A',2); INSERT INTO table_name VALUES ('B',3); INSERT INTO table_name VALUES ('B',4); INSERT INTO table_name VALUES ('B',5); INSERT INTO table_name VALUES ('B',6); INSERT INTO table_name VALUES ('A',7); INSERT INTO table_name VALUES ('A',8); INSERT INTO table_name VALUES ('A',9); select X,COUNT(grp) c from ( SELECT *, ROW_NUMBER() OVER(ORDER BY i) - ROW_NUMBER() OVER(PARTITION BY X ORDER BY i) grp FROM table_name ) t1 group by grp,X
x
c
A
2
B
4
A
3
SELECT 3