Categories

Currently the catalog has 54 active categories with at least one query.

Category name	Number of queries	Ranking based on number of queries
Naming	204	1
User-defined routines	190	2
Validity and completeness	151	3
CHECK constraints	138	4
Derived tables	123	5
Data types	121	6
Relationships between tables	114	7
Comfortability of database evolution	113	8
Comfortability of data management	101	9
Inconsistencies	99	10
Triggers and rules	91	11
Does not work in some earlier PostgreSQL version	90	12
Result quality depends on names	86	13
Uniqueness	83	14
Performance	79	15
Default value	67	16
Security	59	17
Duplication of implementation elements	54	18
Domains	49	19
Missing data	45	20
Structure of base tables	31	21
Sequence generators	30	22
Regular expressions	29	23
Data at the database physical level	25	24
Syntactics	25	24
Temporal data	25	24
Boolean data	24	25
Unused implementation elements	20	26
Database design antipatterns	19	27
Compensating actions	17	28
Field size	16	29
Table inheritance	16	29
System-defined functions	15	30
Transactions	14	31
Data at the database logical level	13	32
Distributed database	13	32
Comments	12	33
Assessment	11	34
Hierarchical data	11	34
User-defined types	11	34
Concurrency control	10	35
Fatal problems	10	35
State machine	10	35
Case sensitivity vs. case insensitivity	9	36
Classifier tables	7	37
Full text search	7	37
Stubs	7	37
TOAST	7	37
Extensions	6	38
Generated columns	6	38
Overloading	6	38
Data redundancy	3	39
Read user data	3	39
Schemas	3	39