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In sql systems other than postgres, such as mysql for instance, prepared statements can use question marks as a placeholder. In postgres, the value placeholder is $#, which one is recommend when the value is the same, reusing the value placeholder or not? How to use placeholders in postgresql?

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The question mark is a placeholder in your sql statement that is given a real value when the statement is executed. For i, c := range columns { if i == 0 { *query += c placeholder += ? } else { *query += , +c placeholder += , ? } } placeholder += ) *query += ) + placeholder } // convert. It seems the query is ok, but it returns empty list or a.

A function 'placeholder' has been used in a true/false expression that is used as a table filter expression.

Why are the names john/jane doe used as placeholder names instead of any other name? They're known as query parameters. Technically, you have the right amount, but you're missing parentheses and commas, and it's broken up throughout your query which i suspect is confusing sql. Even just a list query shows nothing, i tried a lot of stuff i found on internet, i even asked ai for help, but it didn't work.

As a workaround, i'm using the following.

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