How to use CREATE TABLE … AS with Primary Key in SQLite

sqlite

From SQLite documentation for CREATE TABLE http://www.sqlite.org/lang_createtable.html:

A table created using CREATE TABLE AS has no PRIMARY KEY and no
constraints of any kind.

So is there any general way to create table with primary key & other index information ?

Best Answer

I suspect you're missing the difference between CREATE TABLE and CREATE TABLE AS (otherwise known as CTAS).

CREATE TABLE AS allows you to create a table from the resultset of a query.

For example:

CREATE TABLE PHILSUCKS AS ( SELECT PHIL, SUCKS FROM EGGS );

You could, instead of using CTAS, use a "normal" CREATE TABLE statement, then INSERT the rows manually. This allows you to specify the PRIMARY KEY and any constraints. eg:

CREATE TABLE PHILSUCKS
(
  PHIL   INTEGER PRIMARY KEY,
  SUCKS  INTEGER NOT NULL
);

INSERT INTO PHILSUCKS ( SELECT PHIL, SUCKS FROM EGGS );

Obviously, you can also create indexes etc too:

CREATE INDEX EGGSUCKING ON PHILSUCKS (SUCKS);

Hope that helps!

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