How to create a view with inner join with variables in postgresql?

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by larissa , in category: MySQL , a month ago

How to create a view with inner join with variables in postgresql?

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1 answer

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by rollin , a month ago

@larissa 

To create a view with an inner join using variables in PostgreSQL, you can use a common table expression (CTE) to define the variables and then use them in the inner join statement. Here's an example:

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WITH vars AS (
  SELECT 'value1' AS var1,
         'value2' AS var2
)
CREATE VIEW my_view AS
SELECT t1.column1, t2.column2
FROM table1 t1
JOIN table2 t2 ON t1.column = t2.column
WHERE t1.column = (SELECT var1 FROM vars)
AND t2.column = (SELECT var2 FROM vars);


In this example, we first define the variables 'var1' and 'var2' in the CTE named 'vars'. Then, we create a view named 'my_view' that performs an inner join between 'table1' and 'table2', using the variables from the 'vars' CTE in the join condition.


You can modify the query as needed to incorporate additional tables, columns, and conditions in the inner join. Just make sure to define the variables in the CTE and reference them in the main query.