常用的一些sql基础语句汇总
常用的一些sql基础语句汇总
- ==时间转换；case，when，then==
- ==DISTINCT==
- ==mysql增加字段==
- ==mysql，分组==
时间转换；case，when，then
SELECT
tid,
oid,
CASE shop_id
WHEN 9 THEN
'北京零售店'
WHEN 3 THEN
'平台自营店'
END shop_name,
user_id,
bn,
title,
num,
payment,
FROM_UNIXTIME( `pay_time`, '%Y-%m-%d %H:%i:%S' ) as pay_time
FROM
systrade_order
WHERE
tid IN (
4025076720000851
);
DISTINCT
SELECT
COUNT(DISTINCT item_no) AS ctn
FROM
purchase_receipt_line
mysql增加字段
ALTER TABLE `np_crm_fund` ADD `handle_status` tinyint(1) NOT NULL DEFAULT '0' COMMENT '处理状态';
ALTER TABLE `np_crm_fund` ADD `handle_uid` int(10) NOT NULL DEFAULT '0' COMMENT '操作人';
ALTER TABLE `np_crm_fund` ADD `handle_time` int(10) NOT NULL DEFAULT '0' COMMENT '处理时间';
ALTER TABLE `np_crm_fund` ADD `handle_remark` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '处理备注';
ALTER TABLE `np_crm_fund` ADD `handle_content_json` tinytext CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '处理内容';
mysql，分组
#分组后，统计每组的个数
SELECT ppc_shop_id,count(*) AS counts from np_shop_recharge_log
where source=0 and operate =1 GROUP BY ppc_shop_id ORDER BY counts desc LIMIT 5;
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语句常用基础SQL
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