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SELECT * FROM EMPLOYEE_TBL; +-----------+-----------+------------+-------------+-----------------------+--------------+-------+-------+------------+------------+ | EMP_ID | LAST_NAME | FIRST_NAME | MIDDLE_NAME | ADDRESS | CITY | STATE | ZIP | PHONE | PAGER | +-----------+-----------+------------+-------------+-----------------------+--------------+-------+-------+------------+------------+ | 213764555 | GLASS | RBANDON | SCOTT | 1710 MAIN ST | WHITELAND | IN | 47885 | 3178984321 | 3175709980 | | 220984332 | WALLACE | MARIAH | NULL | 7889 KEYSTON AVE | INDIANAPOLIS | IN | 46741 | 3173325986 | NULL | | 311549902 | STEPHENS | TINA | DAWN | RR 3 BOX 17A | GREENWOOD | IN | 47890 | 3178784465 | NULL | | 313782439 | GLASS | JACOB | NULL | 3789 WHITE RIVER BLVD | INDIANAPOLIS | IN | 45734 | 3175457676 | 8887345678 | | 442346889 | PLEW | LINDA | CAROL | 3301 BEACON | INDIANAPOLIS | IN | 46224 | 3172978990 | NULL | | 443679012 | SPURGEON | TIFFANY | NULL | 5 GEORGE COURT | INDIANAPOLIS | IN | 46234 | 3175679007 | NULL | +-----------+-----------+------------+-------------+-----------------------+--------------+-------+-------+------------+------------+ SELECT EMP_ID, CITY FROM EMPLOYEE_TBL GROUP BY CITY, EMP_ID; +-----------+--------------+ | EMP_ID | CITY | +-----------+--------------+ | 311549902 | GREENWOOD | | 220984332 | INDIANAPOLIS | | 313782439 | INDIANAPOLIS | | 442346889 | INDIANAPOLIS | | 443679012 | INDIANAPOLIS | | 213764555 | WHITELAND | +-----------+--------------+ SELECT EMP_ID, CITY FROM EMPLOYEE_TBL GROUP BY CITY, EMP_ID ORDER BY EMP_ID DESC; +-----------+--------------+ | EMP_ID | CITY | +-----------+--------------+ | 443679012 | INDIANAPOLIS | | 442346889 | INDIANAPOLIS | | 313782439 | INDIANAPOLIS | | 311549902 | GREENWOOD | | 220984332 | INDIANAPOLIS | | 213764555 | WHITELAND | +-----------+--------------+ SELECT EMP_ID, CITY FROM EMPLOYEE_TBL GROUP BY CITY, EMP_ID ORDER BY CITY, EMP_ID DESC; +-----------+--------------+ | EMP_ID | CITY | +-----------+--------------+ | 311549902 | GREENWOOD | | 443679012 | INDIANAPOLIS | | 442346889 | INDIANAPOLIS | | 313782439 | INDIANAPOLIS | | 220984332 | INDIANAPOLIS | | 213764555 | WHITELAND | +-----------+--------------+ SELECT SUM(SALARY) AS TOTAL_SALARY FROM EMPLOYEE_PAY_TBL; +--------------+ | TOTAL_SALARY | +--------------+ | 90000.00 | +--------------+ SELECT SUM(SALARY) FROM EMPLOYEE_PAY_TBL GROUP BY SALARY; +-------------+ | SUM(SALARY) | +-------------+ | NULL | | 20000.00 | | 30000.00 | | 40000.00 | +-------------+ SELECT COUNT(*) FROM EMPLOYEE_TBL; +----------+ | COUNT(*) | +----------+ | 6 | +----------+ SELECT CITY, COUNT(*) FROM EMPLOYEE_TBL GROUP BY CITY; -- 这时会分别看到每个不同城市的记录总和，因为其中使用了GROUP BY子句 +--------------+----------+ | CITY | COUNT(*) | +--------------+----------+ | GREENWOOD | 1 | | INDIANAPOLIS | 4 | | WHITELAND | 1 | +--------------+----------+ SELECT * FROM EMPLOYEE_PAY_TBL; +-----------+---------------+------------+----------+-----------------+----------+---------+ | EMP_ID | POSITION | DATE_HIRE | PAY_RATE | DATE_LAST_RAISE | SALARY | BONUS | +-----------+---------------+------------+----------+-----------------+----------+---------+ | 213764555 | SALES MANAGER | 2004-08-14 | NULL | 2009-08-01 | 30000.00 | 2000.00 | | 220984332 | SHIPPER | 2006-07-22 | 11.00 | 1999-07-01 | NULL | NULL | | 311549902 | MARKETING | 1999-05-23 | NULL | 2009-05-01 | 40000.00 | NULL | | 313782439 | SALSEMAN | 2007-06-28 | NULL | NULL | 20000.00 | 1000.00 | | 442346889 | TEAM LEADER | 2000-06-17 | 14.75 | 2009-06-01 | NULL | NULL | | 443679012 | SHIPPER | 2001-01-14 | 15.00 | 1999-01-01 | NULL | NULL | +-----------+---------------+------------+----------+-----------------+----------+---------+ SELECT YEAR(DATE_HIRE) AS YEAR_HIRED, SUM(SALARY) FROM EMPLOYEE_PAY_TBL GROUP BY 1; +------------+-------------+ | YEAR_HIRED | SUM(SALARY) | +------------+-------------+ | 1999 | 40000.00 | | 2000 | NULL | | 2001 | NULL | | 2004 | 30000.00 | | 2006 | NULL | | 2007 | 20000.00 | +------------+-------------+
SELECT * FROM EMPLOYEE_TBL; +-----------+-----------+------------+-------------+-----------------------+--------------+-------+-------+------------+------------+ | EMP_ID | LAST_NAME | FIRST_NAME | MIDDLE_NAME | ADDRESS | CITY | STATE | ZIP | PHONE | PAGER | +-----------+-----------+------------+-------------+-----------------------+--------------+-------+-------+------------+------------+ | 213764555 | GLASS | RBANDON | SCOTT | 1710 MAIN ST | WHITELAND | IN | 47885 | 3178984321 | 3175709980 | | 220984332 | WALLACE | MARIAH | NULL | 7889 KEYSTON AVE | INDIANAPOLIS | IN | 46741 | 3173325986 | NULL | | 311549902 | STEPHENS | TINA | DAWN | RR 3 BOX 17A | GREENWOOD | IN | 47890 | 3178784465 | NULL | | 313782439 | GLASS | JACOB | NULL | 3789 WHITE RIVER BLVD | INDIANAPOLIS | IN | 45734 | 3175457676 | 8887345678 | | 442346889 | PLEW | LINDA | CAROL | 3301 BEACON | INDIANAPOLIS | IN | 46224 | 3172978990 | NULL | | 443679012 | SPURGEON | TIFFANY | NULL | 5 GEORGE COURT | INDIANAPOLIS | IN | 46234 | 3175679007 | NULL | +-----------+-----------+------------+-------------+-----------------------+--------------+-------+-------+------------+------------+ SELECT * FROM EMPLOYEE_PAY_TBL; +-----------+---------------+------------+----------+-----------------+----------+---------+ | EMP_ID | POSITION | DATE_HIRE | PAY_RATE | DATE_LAST_RAISE | SALARY | BONUS | +-----------+---------------+------------+----------+-----------------+----------+---------+ | 213764555 | SALES MANAGER | 2004-08-14 | NULL | 2009-08-01 | 30000.00 | 2000.00 | | 220984332 | SHIPPER | 2006-07-22 | 11.00 | 1999-07-01 | NULL | NULL | | 311549902 | MARKETING | 1999-05-23 | NULL | 2009-05-01 | 40000.00 | NULL | | 313782439 | SALSEMAN | 2007-06-28 | NULL | NULL | 20000.00 | 1000.00 | | 442346889 | TEAM LEADER | 2000-06-17 | 14.75 | 2009-06-01 | NULL | NULL | | 443679012 | SHIPPER | 2001-01-14 | 15.00 | 1999-01-01 | NULL | NULL | +-----------+---------------+------------+----------+-----------------+----------+---------+ SELECT CITY, ZIP, AVG(PAY_RATE), AVG(SALARY) -> FROM EMPLOYEE_TBL E -> INNER JOIN EMPLOYEE_PAY_TBL P -> ON E.EMP_ID = P.EMP_ID -> GROUP BY CITY, ZIP -> ORDER BY CITY, ZIP; +--------------+-------+---------------+--------------+ | CITY | ZIP | AVG(PAY_RATE) | AVG(SALARY) | +--------------+-------+---------------+--------------+ | GREENWOOD | 47890 | NULL | 40000.000000 | | INDIANAPOLIS | 45734 | NULL | 20000.000000 | | INDIANAPOLIS | 46224 | 14.750000 | NULL | | INDIANAPOLIS | 46234 | 15.000000 | NULL | | INDIANAPOLIS | 46741 | 11.000000 | NULL | | WHITELAND | 47885 | NULL | 30000.000000 | +--------------+-------+---------------+--------------+ SELECT CITY, ZIP, AVG(PAY_RATE), AVG(SALARY) -> FROM EMPLOYEE_TBL E -> INNER JOIN EMPLOYEE_PAY_TBL P -> ON E.EMP_ID = P.EMP_ID -> GROUP BY CITY, ZIP -> ORDER BY CITY, ZIP; +--------------+-------+---------------+--------------+ | CITY | ZIP | AVG(PAY_RATE) | AVG(SALARY) | +--------------+-------+---------------+--------------+ | GREENWOOD | 47890 | NULL | 40000.000000 | | INDIANAPOLIS | 45734 | NULL | 20000.000000 | | INDIANAPOLIS | 46224 | 14.750000 | NULL | | INDIANAPOLIS | 46234 | 15.000000 | NULL | | INDIANAPOLIS | 46741 | 11.000000 | NULL | | WHITELAND | 47885 | NULL | 30000.000000 | +--------------+-------+---------------+--------------+ SELECT CITY, ZIP, AVG(PAY_RATE), AVG(SALARY) -> FROM EMPLOYEE_TBL E -> INNER JOIN EMPLOYEE_PAY_TBL P -> ON E.EMP_ID = P.EMP_ID -> GROUP BY CITY, ZIP WITH ROLLUP; -- ROLLUP：完成基本的分组数据汇总后，按照从右到左的顺序，每次去掉字段列表中的最后一个字段，再对剩余的字段进行分组统计 +--------------+-------+---------------+--------------+ | CITY | ZIP | AVG(PAY_RATE) | AVG(SALARY) | +--------------+-------+---------------+--------------+ | GREENWOOD | 47890 | NULL | 40000.000000 | | GREENWOOD | NULL | NULL | 40000.000000 | | INDIANAPOLIS | 45734 | NULL | 20000.000000 | | INDIANAPOLIS | 46224 | 14.750000 | NULL | | INDIANAPOLIS | 46234 | 15.000000 | NULL | | INDIANAPOLIS | 46741 | 11.000000 | NULL | | INDIANAPOLIS | NULL | 13.583333 | 20000.000000 | | WHITELAND | 47885 | NULL | 30000.000000 | | WHITELAND | NULL | NULL | 30000.000000 | | NULL | NULL | 13.583333 | 30000.000000 | +--------------+-------+---------------+--------------+
SELECT AVG(PAY_RATE), AVG(SALARY), AVG(BONUS), POSITION FROM EMPLOYEE_PAY_TBL WHERE POSITION <> ‘SALESMAN‘ GROUP BY POSITION ORDER BY 4; +---------------+--------------+-------------+---------------+ | AVG(PAY_RATE) | AVG(SALARY) | AVG(BONUS) | POSITION | +---------------+--------------+-------------+---------------+ | NULL | 40000.000000 | NULL | MARKETING | | NULL | 30000.000000 | 2000.000000 | SALES MANAGER | | NULL | 20000.000000 | 1000.000000 | SALSEMAN | | 13.000000 | NULL | NULL | SHIPPER | | 14.750000 | NULL | NULL | TEAM LEADER | +---------------+--------------+-------------+---------------+ SELECT AVG(PAY_RATE), AVG(SALARY), AVG(BONUS), POSITION FROM EMPLOYEE_PAY_TBL WHERE POSITION <> ‘SALESMAN‘ GROUP BY POSITION HAVING AVG(SALARY) > 20000 ORDER BY 4; +---------------+--------------+-------------+---------------+ | AVG(PAY_RATE) | AVG(SALARY) | AVG(BONUS) | POSITION | +---------------+--------------+-------------+---------------+ | NULL | 40000.000000 | NULL | MARKETING | | NULL | 30000.000000 | 2000.000000 | SALES MANAGER | +---------------+--------------+-------------+---------------+
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原文地址：http://www.cnblogs.com/fatoland/p/4542298.html
