| Goal | Find primary key, unique, foreign key, and exclude constraints that have been defined in a supertable (parent table) but not in its subtable. Exclude constraints where in case of the subtable there is a CHECK that permits only one specific value in the constraint column. The presence of such check would make the design acceptable. Unfortunately, PostgreSQL table inheritance is implemented in a manner that some constraints (CHECK, NOT NULL) are inherited from the supertable but others are not. "All check constraints and not-null constraints on a parent table are automatically inherited by its children, unless explicitly specified otherwise with NO INHERIT clauses. Other types of constraints (unique, primary key, and foreign key constraints) are not inherited." (PostgreSQL documentation) |
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| Type | General Overview of some aspect of the database. |
| License | MIT (opens in new tab) |
| Data Source | INFORMATION_SCHEMA+system catalog |
| SQL Query |
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Collections
This query belongs to the following collections:
Find problems by overview
Queries that results point to different aspects of database that might have problems. A human reviewer has to decide based on the results as to whether there are problems or not .
| Name | Description |
|---|---|
| Find problems by overview | Queries that results point to different aspects of database that might have problems. A human reviewer has to decide based on the results as to whether there are problems or not . |
Categories
This query is classified under the following categories:
CHECK constraints
Queries of this category provide information about CHECK constraints.
Relationships between tables
Queries of this category provide information about how database tables are connected to each other and whether such connections have been explicitly defined and whether it has been done correctly.
Table inheritance
Queries of this category provide information about the inheritance between base tables.
Validity and completeness
Queries of this category provide information about whether database design represents the world (domain) correctly (validity) and whether database design captures all the information about the world (domain) that is correct and relevant (completeness).
| Name | Description |
|---|---|
| CHECK constraints | Queries of this category provide information about CHECK constraints. |
| Relationships between tables | Queries of this category provide information about how database tables are connected to each other and whether such connections have been explicitly defined and whether it has been done correctly. |
| Table inheritance | Queries of this category provide information about the inheritance between base tables. |
| Validity and completeness | Queries of this category provide information about whether database design represents the world (domain) correctly (validity) and whether database design captures all the information about the world (domain) that is correct and relevant (completeness). |
Further reading and related materials: