Why Am I Still Getting \"Data Truncated for Column\" Errors After Changing the MySQL Column Data Type?

Troubleshooting "Data Truncated for Column" Error After Modifying MySQL Column Data Type

You have modified the data type of a MySQL column to accommodate longer strings, but upon manually updating the data, you encounter the "Data truncated for column" error. This error indicates that the data you are trying to insert exceeds the specified column length.

Diagnosis:

The issue lies with the current length assigned to the modified column. Despite changing the data type to support longer strings, the length of the column remains unchanged, causing data truncation errors.

Solution:

To resolve this issue, follow these steps:

1. Check the Column Length: Determine the current length of the affected column using the following query:

   SELECT column_name, DATA_TYPE, CHARACTER_MAXIMUM_LENGTH
   FROM information_schema.COLUMNS
   WHERE table_name = 'calls'
   AND column_name = 'incoming_Cid';

2. Alter the Column Length: If the column length is insufficient, increase it to the desired maximum length. For example, to set the length of incoming_Cid to 34 characters, execute the following query:

   ALTER TABLE calls CHANGE incoming_Cid incoming_Cid CHAR(34);

3. Verify the Change: After updating the column length, verify the změnu by re-querying the information_schema.COLUMNS table.

Once the column length is adjusted, you should be able to insert the desired data without encountering the truncation error.

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