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SQL within Retool

The following examples use the Retool DB and Retool Query Editor to try out SQL first-hand.

Steps​

The following steps focus on accessing Retool and using RetoolDB, Retool Workflow, Retool Email, and Retool Web Apps to provide a base understanding of the Retool Platform.

Create a Retool account and login​

Create a Retool account and login to your account as shown below.

Create a table in RetoolDB using CSV files​

A key component in the inventory management application is to define a schema / set of data that represents current inventory. Using the following common separate value (CSV) files, the schema can be identified along with sample data into RetoolDB table(s). In this step of the laboratory, two comma separated value files will be used to populate a Retool Database creating two separate tables. The following files need to be downloaded to your computer, in order to perform the following steps.

Once the files are downloaded, we can create tables in the database:

  • In the Retool Home Screen, select Database.
  • In Retool Database, select Import CSV > Into a new table.
  • Select file inventory.csv.
  • Change id, quantity and replenish field type to #int4 in the CSV Import dialog.

CSV Import

  • Select Create table and the table will update as shown in the following figure.

CSV Import

Select​

Select allows you to query the rows in the table for a matching condition. With the table that has been imported create a SQL query by doing the following:

  • Go to the Retool home page. Select the folder that you want the sample application to be placed into and then select Create new / App. For App name, specify sample-query-app and make sure the folder is set properly.
  • Select Code via the icon:
  • Select + to add a Resource query.
  • Under Resource specify Retool Database
  • Within the SQL Query Text Area (e.g. Write query or Ask AI), enter:
select * from inventory;
  • Select Save / Run and the result of the query will display below along with an information message “Query ran successfully”.

Select with Pagination​

In the previous example we had the select statement return all the rows in the inventory table. This can return an arbitrary large number of rows. To limit this and navigate through a large data set, consider using pagination. Within SQL we can do this via the following query:

First 10 rows

select * from inventory limit 10;

Second 10 rows

select * from inventory limit 10 offset 10;

Insert​

Insert will add rows to the table.

  • Select + to add a new query.
  • Copy the following query into the SQL Query Text Area:
insert into inventory (id, sku, description, quantity, replenish, location) values (22, 'MP-001-6991', 'medium-flange-pin', 100, 10, 'Detroit, MI, USA');
  • Select Save / Run and the result of the query will display below along with an information message “Query ran successfully”.
  • Check the Retool Database table and you should see a new entry, with an id of 22.
  • Once the entry has been created, you can query to determine if the new item exists with the following query. Edit the query created in the previous section to use the following. Select Save/Run to see the query:
select * from inventory where id=22;

Update​

To update the previous insert row, we can use the update command.

  • Select + to add a new query.
  • Copy the following query into the SQL Query Text Area:
update inventory set quantity=99 where id=22;

Examining the table, the quantity for id = 22 is now updated to 99 from 100.

Delete​

To delete the inserted / updated row, use delete.

  • Select + to add a new query.
  • Copy the following query into the SQL Query Text Area:
delete from inventory where id=22;

Examining the table, the row with an id = 22 is gone.

Retool JavaScript Parameters in SQL​

Within Retool Queries, SQL queries can leverage dynamic queries using the {{ }} syntax. An example of this could be:

select * from inventory where Description = {{table1.selectedRow.description}}

The parameter for userId is generated by extracting the value of the table1.selectedRow.description.