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:

  1. 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.



  1. 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;

  1. 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';

  1. 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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MySQL 1240: Partition is corrupted.
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MySQL 1238: Cannot repair partition.
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MySQL 1224: Partition not empty.
MySQL 1223: Partition key was not found.
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MySQL 1220: Cannot update parent row.
MySQL 1219: Cannot update child row.
MySQL 1216: Cannot delete or update a parent row.
MySQL 1218: Cannot delete child row.
MySQL 1215: Cannot add foreign key constraint.
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MySQL 1214: Row was updated.
MySQL 1213: Deadlock found when trying to get lock.
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MySQL 1211: Too many open files.
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MySQL 1206: Error in unique key constraint.
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MySQL 1203: Cannot insert entry.
MySQL 1202: Cannot delete entry.
MySQL 1199: Statement failed due to index.
MySQL 1200: Index is corrupted.
MySQL 1201: Duplicate key value.
MySQL 1198: Error closing file.
MySQL 1193: Statement failed due to table.
MySQL 1197: Failed to open file.
MySQL 1175: Statement not allowed in schema.
MySQL 1196: Too many connections.
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MySQL 1195: Table is corrupted.
MySQL 1192: Statement failed due to view.
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