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MySQL 1171: Null column in table.
When encountering the error 1171: Null column in table in MySQL, the user should immediately check which column is causing the issue and ensure that it either has a default value or is not set to NOT NULL without a default value in a table where rows are being inserted without specifying values for all columns. Perform the following actions:
- Identify the table and column causing the issue. This information is typically mentioned in the error message. If not, review the most recent changes to the database schema or the query that triggered the error.
- Check the table schema to see which columns are set to NOT NULL without a default value. Use the following command, replacing `YourTableName` with the name of the table you're investigating:
DESCRIBE YourTableName;
- For the column identified in step 1 or any column that is NOT NULL without a default value, decide if the column should allow NULL values or if it should have a default value. Based on your decision, you have two options:
a. Modify the column to allow NULL values, if it's acceptable for your data model. Replace `YourTableName` and `ColumnName` with the appropriate table and column names:ALTER TABLE YourTableName MODIFY COLUMN ColumnName DataType NULL;
b. Set a default value for the column, ensuring it aligns with your data model. Replace `YourTableName`, `ColumnName`, and `DefaultValue` with the appropriate values:ALTER TABLE YourTableName ALTER COLUMN ColumnName SET DEFAULT 'DefaultValue';
- If the column should neither allow NULL values nor have a default value (e.g., it's a primary key), ensure that your insert or update operations include a value for this column.
By following these steps, you'll address the immediate issue causing the error 1171.
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