mysql查询区分大小写与自定义排序

mysql查询区分大小写：

SELECT id,developer FROM products
WHERE developer != ''
and developer = binary('LYNN')

在查找的条件值加上的binary()

来源：http://my.oschina.net/xiangtao/blog/33983

mysql自定义排序：

select * from user order by field(roleId,2,3,4,1,5);

select * from user order by field(roleId,'张三','李四','王五');

$str = "'张三','李四','王五'";
select * from user order by field(roleId,$str);

$arr = array('张三','李四','王五');
$str = "'".implode("','", $arr)."'"; 
select * from user order by field(roleId,$str);

来源：技术群

CONCAT 拼接mysql

update ratings_store set update_time = CONCAT('2016-08-03',right(update_time,9))

来源：http://honly-java.iteye.com/blog/1633033

select
    (case when id = '' then
        ''
    else
        id
    end)  id
from table

select width,
case height
when '' then '一'
when '' then '二'
when '' then '三'
end '大写'
from table 

CASE WHEN col_1 IN ( 'a', 'b') THEN '第一类'
         WHEN col_1 IN ('a')       THEN '第二类'

http://blog.csdn.net/leamonjxl/article/details/6239948