Postgresql sql error 55000 – quick fix

PostgreSQL SQL Error 55000: Delving into Constraint Violations

PostgreSQL, a powerful relational database management system, occasionally throws a challenge at developers in the form of SQL Error 55000. This error code is associated with constraint violations, signaling that an operation has breached the defined constraints of the database. In this article, we’ll explore the common causes behind PostgreSQL SQL Error 55000 and provide insights into resolving these constraint-related dilemmas.

Common causes of Postgresql SQL error 55000

Unique Constraint Violation

One prevalent cause of SQL Error 55000 is a violation of a unique constraint. This occurs when an attempt is made to insert or update a record with a value in a column that must be unique, but a matching value already exists in the table.

Example

-- Attempting to insert a duplicate value into a column with a unique constraint
INSERT INTO employees (employee_id, name) VALUES (101, 'John Doe');

Foreign Key Constraint Violation

A foreign key constraint ensures that values in a column match values in another table’s column. SQL Error 55000 may occur when an attempt is made to insert or update a record with a foreign key value that doesn’t exist in the referenced table.

Example

-- Attempting to insert a record with a non-existent department_id
INSERT INTO employees (employee_id, name, department_id) VALUES (102, 'Jane Doe', 500);

Check Constraint Violation

Check constraints define conditions that values in a column must meet. Violating a check constraint leads to SQL Error 55000. This can happen when inserting or updating a record with a value that doesn’t satisfy the specified condition.

Example

-- Attempting to insert a negative value into a column with a check constraint
INSERT INTO inventory (product_id, quantity) VALUES (200, -5);

Not-Null Constraint Violation

A not-null constraint ensures that a column cannot contain a null value. SQL Error 55000 may occur when inserting a record that doesn’t provide a value for a column with a not-null constraint.

Example

-- Attempting to insert a record without providing a value for the not-null column
INSERT INTO customers (customer_id, name) VALUES (301, NULL);

Exclusion Constraint Violation

Exclusion constraints define conditions that prevent overlapping ranges of values. SQL Error 55000 can arise when inserting or updating a record that conflicts with an existing record based on the exclusion constraint.

Example

-- Attempting to insert a record with a conflicting range
INSERT INTO schedule (event_name, start_time, end_time) VALUES ('Meeting', '2023-12-18 10:00', '2023-12-18 11:00');

Column Value Too Long

If the length of a value exceeds the defined length for a column, a constraint violation occurs. This often happens with string or character data types.

Example

-- Attempting to insert a value longer than the allowed length
INSERT INTO products (product_id, product_name) VALUES (401, 'ThisProductNameIsWayTooLong');

Inspite of Postgresql SQL error 55000, here’s a list of some common PostgreSQL error codes, including but not limited to Postgresql SQL error 55000:

1. SQL Error 42P01 – Undefined Table: This error occurs when a query references a table that does not exist in the database.
2. SQL Error 42703 – Undefined Column: Triggered when a query attempts to use a column that is not present in the specified table.
3. SQL Error 23505 – Unique Violation: Indicates that an attempt to insert or update a record violates a unique constraint.
4. SQL Error 23502 – Not Null Violation: Occurs when an attempt is made to insert a null value into a column that has a NOT NULL constraint.
5. SQL Error 42P02 – Undefined Parameter: This error is raised when using a parameter that is not defined in the context of the query.
6. SQL Error 22001 – String Data Right Truncation: Signifies that a string or character data is too long for the specified column.
7. SQL Error 42701 – Duplicate Column: Triggered when a table is created with duplicate column names.
8. SQL Error 25P02 – In Failed SQL Transaction: Indicates a problem with transactions, often caused by trying to execute a query within a failed transaction.
9. SQL Error 23000 – Integrity Constraint Violation: This error occurs when a foreign key constraint is violated during an insert or update operation.
10. SQL Error 42602 – Invalid Syntax: Similar to SQL Error 42601, this error code is raised when there’s a syntax error in the SQL statement.
11. SQL Error 28000 – Invalid Authorization Specification: Signifies authentication issues, such as providing incorrect login credentials.
12. SQL Error 57014 – Canceling Statement Due to User Request: Occurs when a user cancels a running query or statement.
13. SQL Error 22003 – Numeric Value Out Of Range: Indicates that a numeric value exceeds the valid range for its data type.
14. SQL Error 08006 – Connection Failure: Raised when there is a problem establishing or maintaining a database connection.
15. SQL Error 42P05 – Duplicate Table: Similar to SQL Error 42701, this error is raised when trying to create a table with a name that already exists.
16. SQL Error 42601 – Syntax error: PostgreSQL uses error code 42601 to signify a syntax error within the SQL statement being executed. This error arises when PostgreSQL encounters a statement with a syntax it cannot recognize or correctly parse.