MySQL string function

turn ASCII code

1. function ：ASCII( character string )

2. Instructions

   SELECT ASCII("A") AS ASCII code ;
   

3. Running results

   

Statistical string length

1. function ：CHAR_LENGTH( character string )

2. Instructions

   SELECT CHAR_LENGTH("abcde") AS  String length ;
   

3. Running results

   

Merge strings

1. function ：CONCAT(s1,s2…sn)

2. Instructions

   SELECT CONCAT("My","SQL") AS  Merge strings ;
   

3. Running results

   

Returns the position of the string

1. function ：FIELD(s,s1,s2…)

2. explain ： The return value is a string s stay s1,s2… Position in the list , The starting position is 1

3. Instructions

   SELECT FIELD("a","b","c","a","d") AS  To find the character a;
   

4. Running results

   

Character to lowercase

1. function ：LCASE( character string )

2. Instructions

   SELECT LCASE("aBcDeF") AS  Turn lowercase ;
   

3. Running results

   

Capitalize characters

1. function ：UCASE( character string )

2. Instructions

   SELECT UCASE("aBcDeF") AS  Turn capitalization ;
   

3. Running results

   

Before removal n Characters

1. function ：LEFT( character string , Location )

2. Instructions

   SELECT LEFT("aBcDeF",3) AS  Take out the characters ;
   

3. Running results