Usage of GROUP BY WITH ROLLUP in Mysql

1. WITH ROLLUP : Perform statistical data on the basis of the group grouping field.

Example: First, group on the name field, and then perform statistics on some fields based on the grouping. The table structure is as follows:

CREATE TABLE `test` (
  `Id` int(11) NOT NULL AUTO_INCREMENT,
  `title` varchar(25) DEFAULT NULL COMMENT '标题',
  `uid` int(11) DEFAULT NULL COMMENT 'uid',
  `money` decimal(2,0) DEFAULT '0',
  `name` varchar(25) DEFAULT NULL,
  PRIMARY KEY (`Id`)
) ENGINE=InnoDB AUTO_INCREMENT=8 DEFAULT CHARSET=utf8mb4;

Save a few pieces of data to see:

INSERT INTO `test`.`test` (`Id`, `title`, `uid`, `money`, `name`) VALUES ('2', '国庆节', '2', '12', '周伯通');
INSERT INTO `test`.`test` (`Id`, `title`, `uid`, `money`, `name`) VALUES ('3', '这次是8天假哦', '3', '33', '老顽童');
INSERT INTO `test`.`test` (`Id`, `title`, `uid`, `money`, `name`) VALUES ('4', '这是Uid=1的第一条数据哦', '1', '70', '欧阳锋');
INSERT INTO `test`.`test` (`Id`, `title`, `uid`, `money`, `name`) VALUES ('5', '灵白山少主', '4', '99', '欧阳克');
INSERT INTO `test`.`test` (`Id`, `title`, `uid`, `money`, `name`) VALUES ('7', '九阴真经创始人', '3', '12', '小顽童');
INSERT INTO `test`.`test` (`Id`, `title`, `uid`, `money`, `name`) VALUES ('8', '双手互博', '2', '56', '周伯通');
INSERT INTO `test`.`test` (`Id`, `title`, `uid`, `money`, `name`) VALUES ('9', '销魂掌', '2', '19', '周伯通');
INSERT INTO `test`.`test` (`Id`, `title`, `uid`, `money`, `name`) VALUES ('10', '蛤蟆功', '1', '57', '欧阳锋');
INSERT INTO `test`.`test` (`Id`, `title`, `uid`, `money`, `name`) VALUES ('11', '绝杀掌', '3', '800', '小顽童');
INSERT INTO `test`.`test` (`Id`, `title`, `uid`, `money`, `name`) VALUES ('12', '九阴真经', '3', '84', '老顽童');

Group statistics:

SELECT name, SUM(money) as money FROM  test GROUP BY name WITH ROLLUP;

You can see that the money is summed and statistics grouped by name. I see null 1242 above, how to make alias field such as total amount: 1242? You can also drop, let's continue:

coalesce(a,b,c);
参数说明：如果a==null,则选择b；如果b==null,则选择c；如果a!=null,则选择a；如果a b c 都为null ，则返回为null（没意义）。

SELECT
	sum(sale_amount - payment_amount) AS creditAmount, SUM(goods_amount),
	coalesce(buyer_name, '总金额') as buyerName
FROM
	dk_sale_order_head
WHERE
	stall_id = 10065
and buyer_name in ('tcc','QTL')
GROUP BY
	buyer_name WITH ROLLUP;

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Usage of GROUP BY WITH ROLLUP in Mysql

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