sql – Oracle创建表AS和表注释和列注释

CREATE TABLE TABLE1_COPY AS SELECT * FROM TABLE1;

前面的语句不包括列的注释.因此,TABLE1_COPY没有列的注释.使用USER_COL_COMMENTS是在我新创建的表上重现相同注释的唯一方法吗？

解决方法

As for DMBS_METADATA.GET_DDL it doesn’t seem to genereate COMMENT ON
COLUMN statements unless I am missing some properties.

一种方法是将dbms_metadata.get_dependent_ddl与dbms_metadata.get_ddl结合使用

以下是使用SQL plus创建的示例：

SQL> set long 1000000

SQL> create table t (x number);

Table created.

SQL> comment on column T.X IS 'this is the column comment';

Comment created.

SQL> comment on table T IS 'this is the table comment';

Comment created.

SQL> SELECT dbms_metadata.get_ddl( 'TABLE','T' ) || ' ' ||
  2         dbms_metadata.get_dependent_ddl( 'COMMENT','T',USER ) the_ddl
  3  FROM dual
  4  /

THE_DDL
--------------------------------------------------------------------------------

  CREATE TABLE "SCOTT"."T"
   (    "X" NUMBER
   ) SEGMENT CREATION DEFERRED
  PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING
  TABLESPACE "USERS"

   COMMENT ON COLUMN "SCOTT"."T"."X" IS 'this is the column comment'

   COMMENT ON TABLE "SCOTT"."T"  IS 'this is the table comment'

（编辑：李大同）

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