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The Substring function in SQL is used to grab a portion of the stored data. This
function is called differently for the different databases:
- MySQL: SUBSTR(), SUBSTRING()
- Oracle: SUBSTR()
- SQL Server: SUBSTRING()
The most frequent uses are as follows (we will use SUBSTR() here):
SUBSTR(str,pos): Select all characters from <str> starting with position <pos>. Note that this syntax is not supported in SQL Server.
SUBSTR(str,pos,len): Starting with the <pos>th
character in string <str> and select the next <len> characters.
Assume we have the following table:
Table Geography
| region_name |
store_name |
| East |
Boston |
| East |
New York |
| West |
Los Angeles |
| West |
San Diego |
Example 1:
SELECT SUBSTR(store_name, 3)
FROM Geography
WHERE store_name = 'Los Angeles';
Result:
's Angeles'
Example 2:
SELECT SUBSTR(store_name,2,4)
FROM Geography
WHERE store_name = 'San Diego';
Result:
'an D'
SQL TRIM >>
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