Why Am I Still Getting a \"Data Truncated\" Error After Updating a MySQL Column\'s Data Type?

Data Truncation Error Post Column Data Type Update

Despite modifying the data type of a MySQL column to support 34-character strings, an error persists upon attempting to manually update data within the column. The error, "Data truncated for column 'incoming_Cid' at row 1," seems puzzling given the appropriate column modification.

Root Cause and Resolution

The issue stems from an incorrect column definition. Upon analysis, it is revealed that the 'incoming_Cid' column is currently declared as CHAR(1), whereas it should be CHAR(34) to accommodate the intended string length.

To rectify the issue, execute the following command:

ALTER TABLE calls CHANGE incoming_Cid incoming_Cid CHAR(34);

This command modifies the column's length from 1 to 34, allowing for the storage of the 34-character strings as intended.

Verification

After executing the command, the 'incoming_Cid' column should now be defined as CHAR(34). To confirm, issue the following query:

<code class="SQL">DESC calls;</code>

The output should display the modified column definition:

<code class="SQL">Field | Type
incoming_Cid | CHAR(34)</code>

Now, the manual update should succeed without any data truncation errors.

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