Question 177761 in PostgreSQL Question posted in
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Can Go join Apache Age tables in Postgresql without error?

I’m working on a Go application which involves performing a join operation between two Apache Age tables. However, I’m facing an error related to the join condition.

When executing the join query between the Apache Age tables, I encountered an error which mentions "invalid join condition.

The expected result is to successfully execute the join operation between the two Apache Age tables, retrieving the desired rows based on the specified join condition.

  1. The Apache Age extension is installed and properly configured.
  2. Both the tables, "table1" and "table2" exist in the database and contain the necessary columns for the join condition.
  3. The join condition used in the query is syntactically correct.
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2

Answers


  1. 0

    I am writing a basic join syntax which can help you in understanding the syntax of the Join query.

    SELECT graph_1.name, graph_1.age, graph_2.license_number
FROM cypher('graph_1', $$
MATCH (v:Person)
RETURN v.name, v.age
$$) as graph_1(col_1 agtype, col_2 agtype, col_3 agtype)
JOIN cypher('graph_2', $$
MATCH (v:Doctor)
RETURN v.name, v.license_number
$$) as graph_2(name agtype, license_number agtype)
ON graph_1.name = graph_2.name

    Now, you can see that we are joining two graphs here. Graph1 and Graph2 are being joined on the basis of name.

    The results displayed from this query is shown below:

    name        age     license_number
‘Andres’    36      1234567890

    You have to ensure that you are fulfilling the syntax criteria and if yes then this error shouldn’t come.

    You can check this documentation for more understanding.

    Documentation Link

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  2. 0

    Since the error says invalid join condition these are somethings that you can do to solve the issue. Furthermore I would appreciate if you can share the query it can help point out the error easily.

    These are some of the things you can do to resolve the issue:

    Check the syntax of the join condition: Make sure that the syntax you are using is valid and according to the Apache age’s documentation.

    If the syntax is correct, then verify the database connectivity. Make sure that your go application is connected to the Apache age’s database correctly and the connection has necessary privileges to perform this operation.

    Also make sure the data types of table are same.

    If you share your code it would help more to locate the actual error.
    You can also refer to Apache age’s documentation Here for more help.

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