在一条语句中使用 PRIMARY KEY 创建 TABLE AS (PostgreSQL)

Question

Is there a way to set the PRIMARY KEY in a single "CREATE TABLE AS" statement?

Example - I would like the following to be written in 1 statement rather than 2:

 CREATE TABLE "new_table_name" AS SELECT a.uniquekey, a.some_value + b.some_value FROM "table_a" AS a, "table_b" AS b WHERE a.uniquekey=b.uniquekey;
 ALTER TABLE "new_table_name" ADD PRIMARY KEY (uniquekey);

Is there a better way of doing this in general (assume there are more than 2 tables, eg 10)?

Answer 1

According to the manual: create table and create table as you can either:

• create table with primary key first, and use select into later
• create table as first, and use add primary key later

But not both create table as with primary key - what you wanted.

Answer 2

If you want to create a new table with the same table structure of another table, you can do this in one statement (both creating a new table and setting the primary key) like this:

CREATE TABLE mytable_clone (
   LIKE mytable 
     INCLUDING defaults
     INCLUDING constraints
     INCLUDING indexes
);

Answer 3

No, there is no shorter way to create the table and the primary key.

Answer 4

See the command below, it will create a new table with all the constraints and with no data. Worked in postgres 9.5

CREATE TABLE IF NOT EXISTS <ClonedTableName>(like <OriginalTableName> including all)

Answer 5

well in mysql,both is possible in one command

the command is

create table new_tbl (PRIMARY KEY(`id`)) as select * from old_tbl;

where id is column with primary key of old_tbl

done...

Answer 6

You may do this way

CREATE TABLE IOT (EMPID,ID,Name, CONSTRAINT PK PRIMARY KEY( ID,EMPID)) 
 ORGANIZATION INDEX NOLOGGING COMPRESS 1 PARALLEL 4
AS SELECT 1 as empid,2 id,'XYZ' Name FROM dual;