本文通过创建测试表并插入数据，演示了如何使用SQL进行分组及计数查询，具体展示了ROW_NUMBER()函数的用法及其在复杂查询中的应用场景。
CREATE TABLE TEST(
ID NUMBER(20),
val NUMBER(20)
)
INSERT INTO TEST VALUES(1,5);
INSERT INTO TEST VALUES(2,10);
INSERT INTO TEST VALUES(3,10);
INSERT INTO TEST VALUES(4,10);
INSERT INTO TEST VALUES(5,6);
INSERT INTO TEST VALUES(6,6);
INSERT INTO TEST VALUES(7,10);
INSERT INTO TEST VALUES(8,10);
SELECT val,COUNT(*) FROM
(
SELECT ID,val,
row_number() OVER(ORDER BY ID)-row_number() OVER(PARTITION BY val ORDER BY ID) x
FROM TEST
)
GROUP BY val,x
ID NUMBER(20),
val NUMBER(20)
)
INSERT INTO TEST VALUES(1,5);
INSERT INTO TEST VALUES(2,10);
INSERT INTO TEST VALUES(3,10);
INSERT INTO TEST VALUES(4,10);
INSERT INTO TEST VALUES(5,6);
INSERT INTO TEST VALUES(6,6);
INSERT INTO TEST VALUES(7,10);
INSERT INTO TEST VALUES(8,10);
SELECT val,COUNT(*) FROM
(
SELECT ID,val,
row_number() OVER(ORDER BY ID)-row_number() OVER(PARTITION BY val ORDER BY ID) x
FROM TEST
)
GROUP BY val,x
ORDER BY MIN(ID);
可根据自己的情况自由发挥
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