MySQL常用SQL語句（CURD，建表，加字段，查改參數）

查詢：

FROM_UNIXTIME()：時間戳轉日期

sum：合計

SELECT
    *,
    FROM_UNIXTIME(a.add_time) AS add_time2,
    SUM(b.goods_number) AS goods_number2
FROM
    ecs_order_info AS a
LEFT JOIN ecs_order_goods AS b
ON
    a.order_id = b.order_id
WHERE
    a.pay_name = '支付寶' AND b.goods_name LIKE '%口罩%' AND a.add_time BETWEEN 1584623511 AND 1589893911
GROUP BY
    a.order_status
HAVING
    a.order_status > 1
ORDER BY
    a.order_id
DESC
LIMIT 0, 5

增加：

INSERT INTO ecs_test(username, PASSWORD, certNo)
VALUES('BABA', '123456', '7894'),('CACA', '123456', '9546')

更新：

UPDATE
    `ecs_test`
SET
    `username` = 'DaDa',
    `password` = '111111'
WHERE
    id = 1

刪除：

DELETE
FROM
    ecs_test
WHERE
    id = 5

建表：

CREATE TABLE `jifen_xianhua_cn`.`ecs_test`(
    `id` INT(11) UNSIGNED NOT NULL AUTO_INCREMENT COMMENT '主鍵',
    `username` VARCHAR(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL COMMENT '用戶名',
    `password` CHAR(32) NULL DEFAULT NULL COMMENT '密碼',
    `status` TINYINT(1) UNSIGNED NULL DEFAULT '0' COMMENT '是否封號 1停用 0啓用',
    `create_time` DATE NULL COMMENT '創建日期',
    `certNo` VARCHAR(64) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '身份證號',
    `pay_self` DECIMAL(10, 2) NOT NULL COMMENT '賣身價',
    PRIMARY KEY(`id`),
    INDEX `idx_username`(`username`),
    UNIQUE `uqu_certNo`(`certNo`(64))
) ENGINE = INNODB CHARSET = utf8 COLLATE utf8_general_ci COMMENT = '用戶表';

加字段：

AFTER：加到之後

FIRST：加到表頭

ALTER TABLE
    `ecs_test` ADD `height` INT(4) UNSIGNED NULL DEFAULT '180' COMMENT '身高(cm)' AFTER `status`,
    ADD INDEX `idx_height`(`height`);

查參數：

SHOW VARIABLES LIKE '%iso%'

改參數值：

[]：代表可選

|：或

persist：永久有效

global：重啓失效

session：當前連接有效

SET [persist | global | session] TRANSACTION ISOLATION LEVEL READ COMMITTED