修改为markdown

Author: CodePlayer7

MySQL note.md

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+1.总天数 select  to_days('2015-1-18')
+2. date('') yMd
+3.当前时间与特定时间所差周数的实现	
+  declare i int;
+  set i =  timestampdiff(week,date(date_add(p_time,interval 8-dayofweek(p_time) day)),date(date_add(now(),interval 8-dayofweek(now()) day)));
+  return  if(i<0,abs(i),i+1) ;
+4.limit后只能跟常量
+5.count() 返回hibernate是BigInteger
+6.hibernate 返回值不add scale,直接返回Object[] 时，sql里不能设置别名 如select text.text as name
+7.insert into table(columns) values(...),(...) mysql批量插入、
+8.update table set 。。 where id=(select * from (select max(id) from table) as A);必须再次select下
+9.SET GLOBAL event_scheduler = ON; 或者在mysql.ini下添加event_scheduler=1
+10.update可以用order by limit 1
+11.alter table users AUTO_INCREMENT=123456
+12.cursor 一定要在not found 时设置标记 然后leave loop。否则死循环！！！！2货