# EXTRACT
<a name="sql-reference-extract"></a>

```
EXTRACT(YEAR|MONTH|DAY|HOUR|MINUTE|SECOND FROM <datetime expression>|<interval expression>)
```

The EXTRACT function extracts one field from a DATE, TIME, TIMESTAMP or INTERVAL expression. Returns BIGINT for all fields other than SECOND. For SECOND it returns DECIMAL(5,3) and includes milliseconds.

## Syntax
<a name="sql-reference-extract-syntax"></a>

### Examples
<a name="sql-reference-extract-examples"></a>


| Function | Result | 
| --- | --- | 
|  <pre>EXTRACT(DAY FROM INTERVAL '2 3:4:5.678' DAY TO SECOND)</pre>  |  2  | 
|  <pre>EXTRACT(HOUR FROM INTERVAL '2 3:4:5.678' DAY TO SECOND)</pre>  |  3  | 
|  <pre>EXTRACT(MINUTE FROM INTERVAL '2 3:4:5.678' DAY TO SECOND)</pre>  |  4  | 
|  <pre>EXTRACT(SECOND FROM INTERVAL '2 3:4:5.678' DAY TO SECOND)</pre>  |  5.678  | 
|  <pre>EXTRACT(MINUTE FROM CURRENT_ROW_TIMESTAMP)<br />where CURRENT_ROW_TIMESTAMP is 2016-09-23 04:29:26.234</pre>  |  29  | 
|  <pre>EXTRACT (HOUR FROM CURRENT_ROW_TIMESTAMP)</pre> where CURRENT\$1ROW\$1TIMESTAMP is 2016-09-23 04:29:26.234  |  4  | 

### Use in Function
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EXTRACT can be used for conditioning data, as in the following function which returns a 30 minute floor when [CURRENT\$1ROW\$1TIMESTAMP](sql-reference-current-row-timestamp.md) is input for p\$1time.

```
CREATE or replace FUNCTION FLOOR30MIN( p_time TIMESTAMP )
RETURNS  TIMESTAMP
CONTAINS SQL
RETURNS NULL ON NULL INPUT
RETURN  floor(p_time to HOUR) + (( EXTRACT (  MINUTE FROM p_time  ) / 30)* INTERVAL '30' MINUTE ) ;
```

You would implement this function using code along the following lines:

```
SELECT stream FLOOR30MIN( CURRENT_ROW_TIMESTAMP ) as ROWTIME , * from "MyStream" ) over (range current row ) as r
```

**Note**  
The code above assumes that you have previously created a stream called "MyStream."