# error: sql: expected 1 argument, got 2

- **ID:** `go/database-sql-prepare-statement-error`
- **Domain:** go
- **Category:** data_error
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

The number of arguments provided to a prepared statement does not match the number of placeholders in the query.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 1.20 | active | — | — |
| 1.21 | active | — | — |

## Workarounds

1. **Use named parameters with sql.Named** (90% success)
   ```
   stmt, err := db.PrepareContext(ctx, "INSERT INTO users(name, age) VALUES(@name, @age)")
if err != nil { return err }
_, err = stmt.ExecContext(ctx, sql.Named("name", "Alice"), sql.Named("age", 30))
   ```

## Dead Ends

- **Counting placeholders manually** — Error-prone for complex queries; use named parameters or helper functions. (70% fail)