Why Does My SQL Query Cause a 'Syntax Error at End of Input' in PostgreSQL?

Syntax Error at End of Input in PostgreSQL: Unraveling the Mystery

When encountering the puzzling "syntax error at end of input" message in PostgreSQL, it's essential to delve into the root cause. While this error may seem obscure, its resolution often lies in the details of your query. One frequent culprit is the use of incorrect parameter placeholders.

The Problematic Query and Error

Consider the following SQL statement:

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

While this statement operates seamlessly in MySQL, it triggers the "syntax error at end of input" error in PostgreSQL. The reason lies in the use of the "?" parameter placeholder, which is native to MySQL but not recognized by PostgreSQL.

Solution: Embracing $1 Syntax

To resolve this issue, replace the "?" placeholders with "$1" syntax specific to PostgreSQL. The modified query should look like this:

WHERE address = 

By adhering to the correct syntax, PostgreSQL can properly interpret the query and execute it without errors.

Understanding PostgreSQL's Cryptic Error Messages

While the "syntax error at end of input" message may seem frustratingly cryptic, it stems from the inability of the PostgreSQL parser to decipher the query. In this case, the parser encounters an unexpected character (?) at the end of the input, rendering it syntactically incorrect.

PostgreSQL error messages, while concise, often provide valuable insights into the source of the issue. By understanding the nature of the error, you can take targeted actions to rectify it and ensure smooth query execution in PostgreSQL.

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