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Assignment

I'm running a mysql query that's returning an error. How do I fix it and include a comma delimited list in the subquery?

Query: SELECT n.type, n.title, FROM_UNIXTIME (n.created,'%Y-%m-%d') AS yearMonthDay, frb.body_value, (SELECT DISTINCT ttd.name as tag FROM taxonomy_term_data ttd LEFT JOIN field_revision_field_tags frft ON frft.field_tags_tid = ttd.tid WHERE frft.revision_id = n.vid) as tags FROM node n LEFT JOIN field_revision_body frb ON frb.revision_id = n.vid WHERE n.type != 'basic_page' AND n.type != 'quote' ORDER BY n.type ASC, n.created ASC;

Error: SQL Error [1242] [21000]: Subquery returns more than 1 row

API request: https://api.openai.com/v1/chat/completions

{ "model": "gpt-4", "messages": [ { "role": "assistant", "content": "mysql database engineer" }, { "role": "user", "content": "I'm running a mysql query that's returning an error. How do I fix it and include a comma delimited list in the subquery?\n\nQuery:\nSELECT\n\tn.type,\n\tn.title,\n\tFROM_UNIXTIME (n.created,'%Y-%m-%d') AS yearMonthDay,\n\tfrb.body_value,\n\t(SELECT DISTINCT ttd.name as tag FROM taxonomy_term_data ttd\n\tLEFT JOIN field_revision_field_tags frft ON frft.field_tags_tid = ttd.tid\n\tWHERE frft.revision_id = n.vid) as tags\nFROM node n\nLEFT JOIN field_revision_body frb ON frb.revision_id = n.vid\nWHERE n.type != 'basic_page'\nAND n.type != 'quote'\nORDER BY n.type ASC, n.created ASC;\n\nError:\nSQL Error [1242] [21000]: Subquery returns more than 1 row" } ], "temperature": 0.9, "user": "user-example-to-monitor-for-abuse" }

Response

The error occurs because the subquery in the SELECT clause returns more than one row, which is not allowed. To fix this, you can use the GROUP_CONCAT function to combine the resulting rows from the subquery into a single comma-separated value. Here's the modified query:

SELECT
    n.type,
    n.title,
    FROM_UNIXTIME(n.created, '%Y-%m-%d') AS yearMonthDay,
    frb.body_value,
    (SELECT GROUP_CONCAT(DISTINCT ttd.name SEPARATOR ',') as tag FROM taxonomy_term_data ttd
     LEFT JOIN field_revision_field_tags frft ON frft.field_tags_tid = ttd.tid
     WHERE frft.revision_id = n.vid) as tags
FROM node n
LEFT JOIN field_revision_body frb ON frb.revision_id = n.vid
WHERE n.type != 'basic_page'
AND n.type != 'quote'
ORDER BY n.type ASC, n.created ASC;

This will return a comma-separated list of tags in the tags column.

Personal Thoughts

That fixed it. I had GROUP_CONCAT in the wrong spot in my first attempt outside this request.