MySQL常用SQL語句（一）

mysql 按照指定欄位的指定值排序：

select * from t_user order by field(id, 0, 2, 11, 1, 3, 4, 5, 6, 8, 9, 10) asc

filed 字段儲存形式為多個逗號隔開的值：1,2,3,5,6

select * from t_user  where find_in_set('1',filed)

select t.created_at,addtime (concat("2014-02-",dayofmonth(t.created_at))+interval 0 hour,time(t.created_at)) as newtime

from t_user t where t.id=1

-- 檢查表,獲得不是ok就是有問題需要修復。

check table t_user;
-- 修復表
repair table `t_user`;

alter table t_logs partition by range(id)  

(partition p0 values less than (3000000), 
partition p1 values less than (6000000), 
partition p2 values less than (9000000), 
partition p3 values less than (12000000), 
partition p4 values less than maxvalue);

select weekofyear(adddate('2012-01-29',1));-- 從星期天開始算第一天

select weekofyear(now());-- 從星期一開始算第一天(其中：now() 為計算當前日期的函式)

update b_gem gem inner join b_productlist list set gem.status='new',gem.storeroomid=list.storeroom where list.type=1 and list.sid=2 and list.serid=gem.serid

select concat(first_name,' ',last_name) as customername from t_agmt_customer

show full fields from t_user;

-- 將選擇 information_schema 資料庫 

select concat(round(sum(index_length)/(1024*1024), 2), ' mb') as 'total index size' from tables where table_schema = 'mytable_test' and table_name='t_user';

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