ALTER object IF EXISTS
Recorded source states and original language descriptions. Missing version evidence stays unknown.
The source snapshot records transitions for PostgreSQL 8.1–18. The historical matrix records independent cells for 7.4–18. Neither records support for PostgreSQL 19 or 20; newer versions remain unknown. These source claims are distinct from runtime measurements.
Data Definition Language (DDL)
Description
Many objects now support IF EXISTS clauses on ALTER statements, such as tables, foreign tables, indexes, sequences etc.
Selected version: PostgreSQL 18
Yes
Compare versions
Original documentation links
Recorded legacy identifiers: 228
Complete source facts and provenance
yaml · center · 1dd22bf9a7f3ec325b894e2836fda535a25529f246a94dd41d6abbfe9997f7fd
{
"Key": "alter-object-if-exists",
"SourceKind": "yaml",
"SourceDatabase": "center",
"SourceTable": "featurematrix.yaml",
"SourceKey": "ALTER object IF EXISTS",
"SourceHash": "1dd22bf9a7f3ec325b894e2836fda535a25529f246a94dd41d6abbfe9997f7fd",
"Name": "ALTER object IF EXISTS",
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"name": "ALTER object IF EXISTS",
"versions": {
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}
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],
"Texts": [
{
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"Title": "ALTER object IF EXISTS",
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{
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"Title": "ALTER object IF EXISTS",
"BodyHTML": "\u003cp\u003e许多对象现在支持 ALTER 语句中的 IF EXISTS 子句，例如表、外部表、索引、序列等。\u003c/p\u003e\n",
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},
"LegacyIDs": [
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]
}