User-defined variables in SQL queries/transformation
Comments
-
Yes, it is possible to create these variables within a MySQL data flow. The syntax however would be slightly different. You would want to use @bob:=Bob and then when referencing it within your select statement use @bob. If you experience any problems implementing this in a data flow, please feel free to email Domo Support at [email protected].
1 -
@ptran, where you able to figure out how to do this?0
-
In my experience, you can't set user defined variables like a typical MySQL script with a SET statement upfront, but you can initialize them inline in a subquery and then reference in an outer select statement. For example, the statement below will initialize @row = 0 and increment +1 for each row in the select statement.
SELECT mydata.*,@row := @row + 1 as `RowNumber`
FROM mydata, (SELECT @row := 0) r;Technically, you could declare a variable such as @Bob in your statement and then filter on that value, like this:
SELECT name
FROM sample_table, (select @Bob := 'Bob') r on name = @Bob
But that would defeat the purpose of declaring a variable and referencing it in many statements, like you indicated with your UNION approach, so I would suggest another approach:Step 1: Create a lookup table to store your values. This could be a webform, or a select statement to generate the columns and values in the first transform step.
Step 2: Join your transaction tables to the lookup table to filter on the specified values
Hope this helps!
Jacob Folsom
**Say “Thanks” by clicking the “heart” in the post that helped you.
**Please mark the post that solves your problem by clicking on "Accept as Solution"1
Categories
- 10.6K All Categories
- 8 Connect
- 918 Connectors
- 250 Workbench
- 474 Transform
- 1.7K Magic ETL
- 69 SQL DataFlows
- 478 Datasets
- 214 Visualize
- 259 Beast Mode
- 2.1K Charting
- 12 Variables
- 19 Automate
- 356 APIs & Domo Developer
- 89 Apps
- 3 Workflows
- 20 Predict
- 5 Jupyter Workspaces
- 15 R & Python Tiles
- 249 Distribute
- 65 Domo Everywhere
- 243 Scheduled Reports
- 21 Manage
- 42 Governance & Security
- 191 Product Ideas
- 1.2K Ideas Exchange
- 11 Community Forums
- 27 Getting Started
- 14 Community Member Introductions
- 55 Community News
- 4.5K Archive