更改列类型 (ALTER TABLE .. ALTER COLUMN TYPE)
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.
No translation of this description is recorded. The original Chinese description is shown. The source label is retained in Chinese; no translated label is recorded.
数据定义语言 (DDL)
Description
允许在线将列的数据类型更改为另一种类型
Selected version: PostgreSQL 18
No
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Original documentation links
Related source snapshot entry · The original source supplies this relationship; each matrix retains its own states.
Complete source facts and provenance
legacy · center · 89976ac33e5281e162a300022c436fd480ef945aac76a874a1c39765a11b9a47
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