Why Jinja and SQL?

Jinja can be used in combination with SQL to create dynamic and flexible SQL queries. Jinja allows you to include variables and expressions in your SQL queries, and to use control structures like if / else and for loops to control the flow of execution and generate more complex queries.

A quick example:

{% set values = [ 'Central','South','East','West'] %}
SELECT
{% for value in values %}
	'{{value}}' as {{ value }},
{% endfor %}

See more examples in the Quiz Section

Jinja Principles

1) Variables

You can use Jinja to parameterize your SQL queries, allowing you to reuse the same query with different input values. For example, you might use a Jinja variable to represent the name of a table, and then use that variable in your SQL query:

SELECT * FROM {{ table_name }};

2) Control Structures

You can use Jinja control structures like if / else to include or exclude parts of your SQL query based on the input data. For example, you might use an if statement to check if a particular variable is set, and then include a WHERE clause in your query if the variable is not null or undefined:

SELECT * 
FROM my_table 
{% if filter_value %} 
	WHERE column = {{filter_value}} 
{% endif %};

3) Iteration with For Loops

You can use Jinja for loops to generate SQL queries with repeated or dynamic elements. For example, you might use a for loop to iterate over a list of columns, and then include those columns in your SQL SELECT statement:

SELECT {% for column in columns %} 
		{{ column }} {% if not loop.last %},{% endif %}
		{% endfor %} 
FROM my_table;

Jinja and SQL in Query.me

In Query.me SQL blocks you can preview your evaluated Jinja by clicking the Jinja button:


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