Re: Insert data if it is not existing

Sorry I forgot to mention. The table that I am working on right now doesn't
have any unique column. AFAIK, I can only use ON CONFLICT if there's an
error for unique column.

On Thu, May 24, 2018 at 8:04 AM, Adrian Klaver <adrian(dot)klaver(at)aklaver(dot)com>
wrote:

> On 05/23/2018 04:58 PM, tango ward wrote:
>
>> Thanks masters for responding again.
>>
>> I've tried running the code:
>>
>> INSERT INTO my_table(name, age)
>> SELECT name, age
>> WHERE NOT EXISTS(SELECT name FROM my_table WHERE name= name)
>>
>
> The first thing I see is that:
>
> SELECT name, age
>
> is not being selected from anywhere, for example:
>
> SELECT name, age FROM some_table.
>
> The second thing I see is why not use ON CONFLICT?
>
>
>>
>> this doesn't give me error but it doesn't insert data either.
>>
>> On Thu, May 24, 2018 at 3:35 AM, Adrian Klaver <adrian(dot)klaver(at)aklaver(dot)com
>> <mailto:adrian(dot)klaver(at)aklaver(dot)com>> wrote:
>>
>> On 05/23/2018 10:00 AM, David G. Johnston wrote:
>>
>> On Wednesday, May 23, 2018, tango ward <tangoward15(at)gmail(dot)com
>> <mailto:tangoward15(at)gmail(dot)com> <mailto:tangoward15(at)gmail(dot)com
>> <mailto:tangoward15(at)gmail(dot)com>>> wrote:
>>
>> I just want to ask if it's possible to insert data if it's
>> not
>> existing yet.
>>
>>
>> This seems more like a philosophical question than a technical
>> one...
>> ​but the answer is yes:
>>
>> CREATE TABLE test_t (a varchar, b varchar, c integer);
>> INSERT INTO test_t
>> SELECT '1', '2', 3 WHERE false;​ --where false causes the data
>> to effectively "not exist"
>>
>> As for ON CONFLICT: conflicts can only happen between things
>> that exist.
>>
>>
>> Well that made my day:)
>>
>>
>> David J.
>>
>>
>>
>> -- Adrian Klaver
>> adrian(dot)klaver(at)aklaver(dot)com <mailto:adrian(dot)klaver(at)aklaver(dot)com>
>>
>>
>>
>
> --
> Adrian Klaver
> adrian(dot)klaver(at)aklaver(dot)com
>