Syntax Corrector | PostgreSQL

SQL Error Correction for INSERT Statement

This guide details the identification and correction of syntax errors in an SQL INSERT statement's ON CONFLICT clause, specifically addressing the misuse of parentheses in the SET clause for an update operation.

Prompt

INSERT INTO manager (
    telegram_id, first_name, 
    last_name, username, nickname, 
    birth_date, language_code, 
    created_at, last_active_at
) VALUES (
    $1, $2, $3, 
    $4, $5, $6, 
    $7, $8, $9
) ON CONFLICT (telegram_id) DO UPDATE SET (
    first_name = $2,
    last_name = $3,
    username = $4,
    last_active_at = $9);

Answer

SQL Syntax Error Fix

Overview

The provided SQL snippet attempts to insert data into a manager table, but contains errors in the ON CONFLICT clause section. Specifically, the use of parentheses in the SET clause is incorrect.

Original Code

INSERT INTO manager (
    telegram_id, first_name, 
    last_name, username, nickname, 
    birth_date, language_code, 
    created_at, last_active_at
) VALUES (
    $1, $2, $3, 
    $4, $5, $6, 
    $7, $8, $9
) ON CONFLICT (telegram_id) DO UPDATE SET (
    first_name = $2,
    last_name = $3,
    username = $4,
    last_active_at = $9
);

Issues Identified

Incorrect use of parentheses in the SET clause after DO UPDATE. The correct syntax does not require parentheses around the assignments.

Refactored Code

INSERT INTO manager (
    telegram_id, first_name, 
    last_name, username, nickname, 
    birth_date, language_code, 
    created_at, last_active_at
) VALUES (
    $1, $2, $3, 
    $4, $5, $6, 
    $7, $8, $9
) ON CONFLICT (telegram_id) DO UPDATE SET 
    first_name = $2,
    last_name = $3,
    username = $4,
    last_active_at = $9;

Explanation of Changes

Removed Parentheses in SET Clause: The parentheses around the assignments have been removed to align with SQL syntax standards for DO UPDATE SET.
- Original Line:
```
SET (
first_name = $2,
last_name = $3,
username = $4,
last_active_at = $9
);
```
- Refactored Line:
```
SET 
first_name = $2,
last_name = $3,
username = $4,
last_active_at = $9;
```

Conclusion

The refactored code is now free of syntax errors and adheres to SQL standards. By eliminating unnecessary parentheses in the SET clause, the query maintains its intended functionality while ensuring correctness.