MySQL 某列数据所占总和百分比 SQL实例 - 搞定你了随便吧

MySQL 某列数据所占总和百分比 SQL实例

SET NAMES utf8;
SET FOREIGN_KEY_CHECKS = 0;
-- ----------------------------
-- Table structure for person_base_info
-- ----------------------------
DROP TABLE IF EXISTS `person_base_info`;
CREATE TABLE `person_base_info`  (
  `uuid` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
  `name` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `address` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `email` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  PRIMARY KEY (`uuid`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Compact;

-- ----------------------------
-- Records of person_base_info
-- ----------------------------
INSERT INTO `person_base_info` VALUES (\'w1e2233rf\', \'5\', \'深圳\', \'222@qq.om\');
INSERT INTO `person_base_info` VALUES (\'we33212\', \'2\', \'深圳\', \'225452@qq.om\');
INSERT INTO `person_base_info` VALUES (\'we33rf\', \'1\', \'深圳\', \'224232@qq.om\');
INSERT INTO `person_base_info` VALUES (\'we5663rf\', \'4\', \'北京\', \'28822@qq.om\');
INSERT INTO `person_base_info` VALUES (\'wewq33rf\', \'3\', \'深圳\', \'222@qq.om\');

SET FOREIGN_KEY_CHECKS = 1;

查询出所有数据:

SELECT  *   FROM person_base_info

 

 查询地址所占比:

SELECT
a.address,
a.cont AS countAddress,
b.sum AS sumAddress,
CONCAT( ROUND( a.cont / b.sum * 100, 2 ), \'\', \'%\' ) AS percent 
FROM
( SELECT address, COUNT( address ) AS cont FROM person_base_info GROUP BY address ) a,(
SELECT
COUNT(*) AS sum 
FROM
person_base_info 
) b

 

SQL函数解释：

MySQL ROUND(x) 函数返回最接近于参数 x 的整数；ROUND(x,y) 函数对参数x进行四舍五入的操作，返回值保留小数点后面指定的y位。

MySQL CONCAT（）函数用于将多个字符串连接成一个字符串。