Why Does My PostgreSQL Query Return a 'syntax error at end of input'?

Understanding the "Syntax error at end of input" Error in PostgreSQL

In PostgreSQL, the error message "pq: F:"scan.l" M:"syntax error at end of input" S:"ERROR" C:"42601" P:"50" R:"scanner_yyerror" L:"993"" indicates a problem with the syntax of a SQL statement.

Cause:

The specific issue in this case is likely due to the parameter placeholder character used in the prepared statement.

MySQL uses ? as the parameter placeholder, while PostgreSQL uses $1, $2, etc. In the provided SQL statement:

db.Query(`SELECT COUNT(*) as N FROM email WHERE address = ?`, email)

the question mark (?) is being used as a placeholder for the email address. However, PostgreSQL doesn't recognize this syntax.

Solution:

To resolve this issue, simply replace the question mark with $1:

db.Query(`SELECT COUNT(*) as N FROM email WHERE address = `, email)

Recommendation:

To avoid such errors in the future, always use the correct parameter placeholder supported by your specific database system.

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