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Description

MySQL Error 1423 occurs when a field within a view refers to a column in the underlying base table that is defined as `NOT NULL` but does not have an explicit `DEFAULT` value. This prevents MySQL from determining a default for that view field, leading to an error during view creation or modification.

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Error Message

Field of view '%s.%s' underlying table doesn't have a default value

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Known Causes

3 known causes

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Base Table Column Missing Default

A column in the underlying base table, which is referenced by the view, is defined as `NOT NULL` but lacks an explicit `DEFAULT` value.

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Implicit Default Value Expectation

The view definition implicitly expects a default value for a specific field, but its corresponding `NOT NULL` column in the base table does not supply one.

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Underlying Schema Changes

The base table schema was modified, for instance by removing a `DEFAULT` value from a `NOT NULL` column, causing conflicts with views referencing it.

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Solutions

3 solutions available

1. Add a DEFAULT value to the underlying table column medium

Modify the base table to provide a default value for the column used in the view.

1

Identify the table and column that are causing the error. The error message '%s.%s' will typically show the schema and table name, and you'll need to infer the column from the view definition.

2

Use the ALTER TABLE statement to add a DEFAULT constraint to the identified column in the underlying table. Choose a sensible default value based on the column's data type and intended use.

ALTER TABLE your_table_name MODIFY your_column_name data_type DEFAULT your_default_value;

3

Recreate the view after modifying the table. This will allow the view to correctly reference the column with its new default value.

DROP VIEW IF EXISTS your_view_name;
CREATE VIEW your_view_name AS SELECT ... FROM your_table_name;

2. Remove the problematic column from the view easy

Exclude the column that lacks a default value from the view definition.

1

Examine the definition of the view causing the error to identify which column from the underlying table is being selected.

2

Modify the CREATE VIEW statement to exclude the column that does not have a DEFAULT value defined in its base table. If this column is not essential for the view's purpose, this is a quick solution.

DROP VIEW IF EXISTS your_view_name;
CREATE VIEW your_view_name AS SELECT column1, column2, ... FROM your_table_name;

3. Provide a literal value for the column in the view definition medium

Assign a specific, hardcoded value to the column within the view's SELECT statement.

1

Identify the column in the underlying table that lacks a default value and is causing the view creation to fail.

2

Modify the CREATE VIEW statement to select a literal value instead of directly referencing the problematic column. This literal value will be used for that 'column' in the view.

DROP VIEW IF EXISTS your_view_name;
CREATE VIEW your_view_name AS SELECT column1, 'your_literal_value' AS problematic_column_alias, ... FROM your_table_name;

3

Ensure that the literal value you provide is compatible with the intended data type of the original column. This approach effectively bypasses the need for a default value on the base table column for the purpose of the view.

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Related Errors

5 related errors

MySQL Error 1423: View Field Missing Default Value