如何在sqlite的SELECT语句中将INSERT用作子查询？

Question

I want something like this. But I dont know the proper syntax.

select id from table1
where name = (insert into table1 (name) values ('value_abcd'))

Answer 1

When you say:

WHERE something = somethingElse

somethingElse is an expression (so is something , but anyway). You are trying to use an INSERT statement as your somethingElse , but an INSERT statement doesn't return anything, so it can not be evaluated as an expression. Therefore, not only is whatever you're trying to invalid syntax, it also doesn't make any sense in a pseudo-code kind of way.

Perhaps if you can try to explain more clearly what it is you're trying to do (and why), someone will be able to suggest something for you.

Answer 2

So you have a table with an autoincrementing primary key, and you want to know its value after you have inserted a record.

In SQL, you can use the last_insert_rowid function:

INSERT INTO table1(name) VALUES('value_abcd');
SELECT last_insert_rowid();

However, in most cases you do not need to execute a separate SELECT query because most libraries have some function to return that value. For example, SQLite's C API has the sqlite3_last_insert_rowid function, and Android's insert function returns the ID directly.

Answer 3

If id column of the table is set as identity, then in SQL

insert into table1(name) value('name')
select SCOPE_IDENTITY()

It will return last auto generated idetity value

If id column is not set as identity then in SQL

insert into table1(name)
output inserted.id
value('name')

It will return all id values inserted in a single statement.