Why am I getting \'Error Code: 1062. Duplicate Entry Error: Solving the \'ID\' Column Issue\'?

Error Code: 1062. Duplicate Entry Error: Solving the "ID" Column Issue

The error encountered, "Error Code: 1062. Duplicate entry '1' for key 'PRIMARY'," signifies a conflict in values within a primary key. Let's delve into the table and determine the root cause of this issue:

UFICIO-INFORMAZIONI Table

The provided table outlines the columns of the UFFICIO-INFORMAZIONI table, which includes 'ID,' 'viale,' and other attributes. The 'ID' column is designated as the primary key, indicating that its values must be unique for each row.

The Cause of the Duplicate Entry Error

The error arises because the 'ID' column is defined with duplicate entries. In the SQL statement you provided:

<code class="sql">INSERT INTO `PROGETTO`.`UFFICIO-INFORMAZIONI` (`ID`, `viale`, `num_civico`, ...)
VALUES (1, 'Viale Cogel ', '120', ...)</code>

The 'ID' column is explicitly set to '1,' which contradicts the primary key constraint. Since the primary key must be unique, the database generates the error.

Solution: Utilizing AUTO_INCREMENT

To resolve this issue, consider setting the 'ID' column as AUTO_INCREMENT. By doing so, the database automatically generates unique values for the 'ID' column during insert operations, ensuring the integrity of the primary key.

Here's the modified table definition with AUTO_INCREMENT:

<code class="sql">CREATE  TABLE IF NOT EXISTS `PROGETTO`.`UFFICIO-INFORMAZIONI` (
  `ID` INT(11) NOT NULL AUTO_INCREMENT,
  `viale` VARCHAR(45) NULL ,
   .....</code>

Inserting Records Without Specifying 'ID'

When inserting records with AUTO_INCREMENT enabled, you can skip specifying the 'ID' column in the SQL statement. The database automatically assigns a unique ID to each row.

For example:

<code class="sql">INSERT INTO `PROGETTO`.`UFFICIO-INFORMAZIONI` (`viale`, `num_civico`, ...)
VALUES ('Viale Cogel ', '120', ...)</code>

By addressing the duplicate entry issue and implementing AUTO_INCREMENT, you can ensure the smooth insertion of records into the UFFICIO-INFORMAZIONI table.

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