Count jsonb column where data is LIKE a sting in PostgreSQL 12

user_4687705 0
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I have data in a jsonb column that looks like this...

{
    "1": {
        "Answer": "Incorrect:No"
    },
    "2": {
        "Answer": "Correct:The troubleshooting steps are correct",
        "Comment": "Computer was not restarted."
    },
    "3": {
        "Answer": "Correct:The actions taken were correct"
    },
    "4": {
        "Answer": "Correct:Clear next steps were provided.",
        "Comment": "Followup on fixing this issue."
    }
}

What I want to do is get a count by question (1-4) of how many records have start with "Incorrect". I have the following query...

SELECT Count(reviews) FROM reviews WHERE review->'1'->>'Answer' LIKE 'Incorrect:%'

This will give me a count for that one question but I don't want to have 4 queries if I can help it. I've tried...

SELECT 
Count(review->'1'->>'Answer' LIKE 'Incorrect:%') AS "Count1",
Count(review->'2'->>'Answer' LIKE 'Incorrect:%') AS "Count2"
FROM reviews;

But that counted all columns. Any ideas?

postgresql-12 postgresql
1 Answers

demo:db<>fiddle (Note that I made answer 4 incorrect as well for testing purposes)

SELECT 
    COUNT(*) 
FROM mytable,
    json_each(mydata) as data                  
WHERE data.value ->> 'Answer' LIKE 'Incorrect%'

json_each() extracts all JSON elements into an own row. This can be used to check them separately and group their results afterwards.

user_39842210
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