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Category: LifeQ:
Why can't I have both select and insert when opening a table?
When I want to open a table or create it in Oracle, I have to choose:
create table test1
(n number)
insert into test1
values(2)
OR
create table test1
(n number)
My question is, why can't I have both?
Or is it just me? I mean, I can't help feeling that either it's just me or it's a "big restriction". Like people who do not like SQL or don't like to write SQL can't help feel that it's because I hate SQL so I just have to learn to live with it.
A:
SQL is a declarative language, not a procedural one. A select statement is the same thing as an insert statement.
The keyword "into" indicates the "where" clause, i.e. on what data to operate.
A:
Both SQL statements are, in a sense, the same. This is not a limitation but the way SQL is designed to be used.
A typical SELECT statement selects a set of data (rows in a table, for example). An INSERT statement, on the other hand, inserts a row into a table. The INTO keyword tells Oracle which data to insert.
So, you could have both statements in a single query, e.g.
SELECT * FROM T;
INSERT INTO T (X, Y) VALUES (1, 2);
If you don't use the INTO keyword, Oracle just inserts a row without selecting from the table first.
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