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Use this Snap to add the LIMIT clause to the incoming SQL query. The LIMIT clause sets an upper limit on the number of records returned by the SQL query. Additionally, you can also specify an offset value so that the Snap displays the records from the specified offset value up to the number of records based on the specified limit. This Snap also allows you to preview the result of the output query. You can validate the modified query using this preview functionality.
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|Input/Output||Type of View||Number of Views||Examples of Upstream and Downstream Snaps||Description|
|The SQL query in which you want to add the LIMIT clause.|
The incoming SQL query with the LIMIT clause.
You can use the SQL Expressions and Functions supported for ELT to define your Snap or Account settings with the Expression symbol = enabled, where available. This list is common to all target CDWs supported. You can also use other expressions/functions that your target CDW supports.
|Parameter Name||Data Type||Description||Default Value||Example|
|Label||String||ELT Limit||Top 10 Records|
|Get preview data||Check box||Not selected||Selected|
|ELT Limit||Integer||Required. The maximum number of records to be displayed.||N/A||3|
|ELT Limit Offset (Not valid for Azure Synapse and Databricks Lakehouse Platform)||Integer|
The number of rows from the top that you want to skip. If this field is not configured, then the Snap fetches from the first row of records. For example, if you specify 2 here, then the Snap fetches records from the third row up to the number of rows specified in the ELT Limit field.
Retrieving a Fixed Number of Records from a Table
In a typical scenario, we use the SELECT command to retrieve records from a table. We can control how many records are retrieved by specifying a WHERE condition. However, if we want to limit the number of records retrieved from the table without any conditions, or if we want to retrieve a fixed number of records starting from a specific row, we must use the SELECT command with the LIMIT clause. This example shows how we can use the ELT Limit Snap to achieve this result.
First, we use the ELT Select Snap to build a query to retrieve all records from the target table.
Upon execution, this Snap builds the query as shown below:
Then, we add the ELT Limit Snap and configure it as needed. In this example, we want to retrieve the next 5 records after the first record. So, we configure the ELT Limit Snap as shown below:
Based on this configuration, the ELT Limit Snap retrieves 5 (ELT Limit field's value) records starting from the second record (ELT Limit Offset field's value)
We can also add an ELT Insert-Select Snap downstream and write the result of this query into another table.
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