mysql 中的like查找不忽略大小写

like默认情况下是忽略大小写的，但是加上collate latin1_general_cs就可以避免这种情况了

例子如下：

The following two statements illustrate that string comparisons are not case sensitive unless one of the operands is a case sensitive (uses a case-sensitive collation or is a binary string):

 
 
   
   
   
   

  
  
    
    
    
    

   
   
  
  
    
    
    
    
 
 
   
   
   
   
mysql> SELECT 'abc' LIKE 'ABC';
        -> 1
mysql> SELECT 'abc' LIKE _latin1 'ABC' COLLATE latin1_general_cs;
        -> 0
mysql> SELECT 'abc' LIKE _latin1 'ABC' COLLATE latin1_bin;
        -> 0
mysql> SELECT 'abc' LIKE BINARY 'ABC';
        -> 0