How to Fix \"Data Truncated for Column\" Error in MySQL When Increasing Column Length?

Data Truncation Issue in MySQL

When modifying a MySQL column to accommodate extended data, you may encounter a "Data truncated for column" error. This response addresses such an issue, specifically regarding a call ID column with 34-character strings.

The error occurs because the column's data type is not properly configured to store the intended data. In this case, the incoming_Cid column is defined as CHAR(1) while it should be CHAR(34).

To resolve this:

1. Check the current length of the incoming_Cid column:

ALTER TABLE calls SHOW COLUMNS LIKE 'incoming_Cid';

2. Issue the following command to change the column's length:

ALTER TABLE calls CHANGE incoming_Cid incoming_Cid CHAR(34);

This will update the column's data type to accommodate the desired 34-character string.

Once the column's data type is correctly defined, you should be able to successfully update the data without encountering the truncation error.

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