Concepts → Query System Variable
About Query System Variables
Query system variables reference information to be used in a query. You use a query system variable when building a query connecting to a data source. Query system variables are available to all users that can conduct queries from data sources.
You can use query system variables to specify a window of time for incremental table loads, from a SQL data source. You can use these variables in the WHERE clause of a SQL query. Query system variables support both Query and Update Query configurations.
Available Query System Variables
The following are the available query system variables within Incorta:
| Variable | Data Type | Description | Example |
|---|---|---|---|
$$job_extract_start_time |
timestamp | Dynamically evaluates to the start time of the query execution | 10/3/20, 5:12:14 PM |
$$job_extract_reference_time |
timestamp | Dynamically evaluates to the last successful extract time | 9/15/20, 8:25:12 AM |
To reference a query system variable, you must specify a $$ double dollar sign.
Example of Query System Variables
The following example shows how you would use query system variables in the edit query panel of a connector:
SELECT
`ID`,
`NAME`,
`OWNDERID`,
`LOCATION`,
`CREATIONDATE`,
`MODIFIERDATE`,
`MODIFICATIONDATE`,
`DESCRIPTION`,
`PARENT`,
`TYPE`
FROM
`incorta`, `DATAFILE`
WHERE
`CREATIONDATE` > $$job_extract_reference_time
AND
`CREATIONDATE` < $$job_extract_start_time