MySQL sort

1, Basic DESC、ASC Sort

	select * from tableName order by columnName1 desc,columnName2 asc;

2, Chinese sorting .MySQL Queries are case insensitive , Commonly used ISO-8859 As the default character set . Therefore, there is no way to correctly compare Chinese encoded characters . There are two ways to solve ：

	1.  Under table , Add "binary" attribute . example ：name varchar(5) binary.
	2.  Force on query MySQL Use the specified characters to query , keyword "convert()". example ：
	select * from tableName order by convert(columnName using gbk);

3, Sort by value

	 Match the field value with "value1","value2","value3" Compare , And output in the corresponding order , If you encounter str by null Or if it doesn't exist , Then the sequence is 0.
	 example ：select * from tableName order by field(columnName,"value1","value2","value3");