On Tue, 05 Mar 2019 13:58:06 -0700
"Keith Medcalf" wrote:
> >The query requests no such thing. SQL makes no request or
> >suggestion for how to execute a query. It simply describes a result.
> >It's up to the implementation to determine how to produce that
> >result.
>
> You are, of course,
On Tuesday, 5 March, 2019 12:53, James K. Lowden
wrote:
>On Mon, 04 Mar 2019 20:20:08 -0700> "Keith Medcalf"
>wrote:
>> In the first query the subselect that creates the list is
>> independent.
>> In the second query the subselect that creates the list is
>> correlated.
>Yes, and if it can
On Mon, 04 Mar 2019 20:20:08 -0700
"Keith Medcalf" wrote:
> In the first query the subselect that creates the list is independent.
> In the second query the subselect that creates the list is correlated.
Yes, and if it can be shown that the two queries are logically
equivalent under relational
On Tuesday, 5 March, 2019 04:09, Simon Slavin wrote:
>On 5 Mar 2019, at 2:06am, kk wrote:
select * from t1
where c=1 and d in (select d from t2 where c=1);
select * from t1
where c=1 and d in (select d from t2 where t2.c=t1.c);
>> DRH, many thanks for your reply, I
On 5 Mar 2019, at 2:06am, kk wrote:
>>> select * from t1
>>>where c=1 and d in (select d from t2 where c=1);
>>> select * from t1
>>>where c=1 and d in (select d from t2 where t2.c=t1.c);
> DRH, many thanks for your reply, I was expecting same output because I
> believe stmts to be
On 2019/03/05 4:06 AM, kk wrote:
On 05/03/2019 01:33, Richard Hipp wrote:
create table t1(c,d);
create table t2(c,d);
explain select * from t1
where c=1 and d in (select d from t2 where c=1);
explain select * from t1
where c=1 and d in (select d from t2 where t2.c=t1.c);
DRH, many
o: sqlite-users@mailinglists.sqlite.org
>Subject: [sqlite] Equiv stmts, different explain plans
>
>On another DB I came across 2 stmts, that I think are equivalent, but
>generated different explain plans. I request a second opinion - are
>these 2 stmts equivalent? If so, why do they gene
On 05/03/2019 01:33, Richard Hipp wrote:
On 3/4/19, Kyle wrote:
On another DB I came across 2 stmts, that I think are equivalent, but
generated different explain plans. I request a second opinion - are
these 2 stmts equivalent? If so, why do they generate different explain
plans even on
On 3/4/19, Kyle wrote:
> On another DB I came across 2 stmts, that I think are equivalent, but
> generated different explain plans. I request a second opinion - are
> these 2 stmts equivalent? If so, why do they generate different explain
> plans even on sqlite?
The two SELECT statements below
On another DB I came across 2 stmts, that I think are equivalent, but
generated different explain plans. I request a second opinion - are
these 2 stmts equivalent? If so, why do they generate different explain
plans even on sqlite?
TIA
--
create table t1(c,d);
create table t2(c,d);
explain
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