PostgreSQL 15 ← 14
← Catalog atlas / pg_conversion
SYSTEM CATALOG · System catalog
pg_conversion
The catalog pg_conversion describes encoding conversion functions. See CREATE CONVERSION for more information.
Checked column by column against a PostgreSQL 18.6 instance · Raw measurement record ↗
Columns PostgreSQL 18
pg_conversionPostgreSQL 19 beta 3 is a preview snapshot; the structure can still change before release.
| COLUMN | TYPE | DESCRIPTION |
|---|---|---|
oid |
oidNOT NULL |
Row identifier |
conname |
nameNOT NULL |
Conversion name (unique within a namespace) |
connamespace |
oidNOT NULL |
The OID of the namespace that contains this conversionReferences:pg_namespace.oid |
conowner |
oidNOT NULL |
Owner of the conversionReferences:pg_authid.oid |
conforencoding |
integerNOT NULLDocumented as:int4 |
Source encoding ID (pg_encoding_to_char() can translate this number to the encoding name) |
contoencoding |
integerNOT NULLDocumented as:int4 |
Destination encoding ID (pg_encoding_to_char() can translate this number to the encoding name) |
conproc |
regprocNOT NULL |
Conversion functionReferences:pg_proc.oid |
condefault |
booleanNOT NULLDocumented as:bool |
True if this is the default conversion |
Columns marked "implicit" are not included in SELECT *; some early statistics views are completed from same-version source, and the extra provenance is shown in the column description.
Common system columns 6
System attributes PostgreSQL provides, normally not expanded by SELECT *. Kept separately so they are not mixed in with ordinary columns.
| Columns | Type | attnum |
|---|---|---|
tableoid | oid | -6 |
cmax | cid | -5 |
xmax | xid | -4 |
cmin | cid | -3 |
xmin | xid | -2 |
ctid | tid | -1 |
Column evolution matrix
Hover a cell for the column typePresentAdded / type or attribute changeRemoved
| COLUMN | 9.0 | 9.1 | 9.2 | 9.3 | 9.4 | 9.5 | 9.6 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
oid |
|||||||||||||||||
conname |
|||||||||||||||||
connamespace |
|||||||||||||||||
conowner |
|||||||||||||||||
conforencoding |
|||||||||||||||||
contoencoding |
|||||||||||||||||
conproc |
|||||||||||||||||
condefault |
9.0 is the coverage baseline; a column already present in the baseline is not marked as added. The matrix aligns columns by name, so a rename appears as the old column removed and a new column added.
Evolution timeline
Changes between adjacent majorsPostgreSQL 12 ← 11
PostgreSQL 11 ← 10
PostgreSQL 9.3 ← 9.2
PostgreSQL 9.1 ← 9.0
Compare any two versions
Pick two versions to see added, removed, and retyped columns. The interactive comparison needs JavaScript; the evolution timeline reads fine without it.