SQL
Rules for Case-Sensitivity
With the `preserve_identifier_case` [configuration option](#docs:configuration:overview::configuration-reference) set to `false`, all identifiers are turned into lowercase:  
```sql
SET preserve_identifier_case = false;
CREATE TABLE tbl AS SELECT cos(pi()) AS CosineOfPi;
SELECT CosineOfPi FROM tbl;
```  
| cosineofpi |
|-----------:|
| -1.0       |