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CREATE TABLE test_tbl ( id int, price int, rowNo int ); INSERT INTO test_tbl VALUES (1,100,1 ), (1,100,2 ), (1,200,3 ), (1,100,4 ), (1,300,5 ), (1,100,6 ), (1,100,7 ), (2,500,9 ), (2,500,10), (2,500,11), (2,500,12), (2,500,13), (2,500,14), (3,400,15);
SELECT id,price,rowNo FROM ( SELECT *, IF(@prevprice = YT.price, @rn := @rn + 1, IF(@prevprice := YT.price, @rn := 1, @rn := 1) ) AS rn FROM test_tbl YT CROSS JOIN ( SELECT @prevprice := -1, @rn := 1 ) AS var ORDER BY YT.id ) AS t WHERE t.rn = 1 ORDER BY t.id
id
price
rowNo
1
100
1
1
200
3
1
100
4
1
300
5
1
100
6
2
500
9
3
400
15