mysql concat函数 字符串连接

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mysql concat函数 字符串连接

1.     <span style="color: #0000ff; font-size: medium;">1.concat?</span>?
   
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3. <span style="white-space: pre;"> </span>select concat("http://",host,":",port) from hostInfo
   
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5. ?
   
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7. <span style="color: #0000ff; font-size: medium;">2.concat_ws?</span>concat with seperator
   
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9. <span style="white-space: pre;"> </span>select concat("|", f1,f2 ) from table
   
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11. ?
    
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13. <span style="color: #ff0000; font-size: medium;">3.group_concat </span>? group by 的加强版
    
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15. <span style="white-space: pre;"> </span>select age, group_concat(name) from student_info group by age;
    
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17. ?
    
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参见

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http://apps.hi.baidu.com/share/detail/21460200