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Substring: more doc, more examples #6

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26 changes: 25 additions & 1 deletion Substring.md
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# Keyword `SUBSTRING`

AlaSQL supports ```SUBSTRING(string, start, length)``` function:

```string```: The string you want to slice.

```start```: Where the substring should start. Positive value counts from left. First character is ```1```. Zero and negative values count from right where ```0``` is the last character.

```length```: How many characters shall the substring have. If ```length``` is left out or larger than the rest of the ```string```, then ```SUBSTRING``` returns all remaining characters.

## Examples

```sql
SELECT SUBSTRING('abc',1)
SELECT SUBSTRING('abcd',1)
-- returns 'abcd'
SELECT SUBSTRING('abcd',3)
-- returns 'cd'
SELECT SUBSTRING('abcd',1,2)
-- returns 'ab'
SELECT SUBSTRING('abcd',2,2)
-- returns 'bc'
SELECT SUBSTRING('abcd',2,4)
-- returns 'bcd'
SELECT SUBSTRING('abcd',0)
-- returns 'd'
SELECT SUBSTRING('abcd',-1)
-- returns 'cd'
SELECT SUBSTRING('abcd',-5,3)
-- returns 'abc'
```