So this is from the docs:

> 
> To disable autocommit mode implicitly for a single series of
>  statements, use the `START TRANSACTION` statement:
> 
> 
> 

```
START TRANSACTION;
SELECT @A:=SUM(salary) FROM table1 WHERE type=1;
UPDATE table2 SET summary=@A WHERE type=1;
COMMIT;

```

So from my understanding, unlike using `BEGIN`; command which shouldn't set autocommit to 0, `START TRANSACTION` should set it to 0.

Now if I do this (after I start a transaction):

```
select @@autocommit;

```

I get the value of 1.

Why autocommit is still enabled even if I use `START TRANSACTION` command? I thought that the `autocommit` variable is local to a single session. Or maybe even if it says 1, it is actually set to 0 within a transaction but just can't get that info by running a `SELECT @@autocommit;` query?