Lajos Arpad - 1 year ago 73

SQL Question

Let us suppose that I need to

`insert`

`t1.c1`

`insert into t1(c1, c2, c3)`

values

('a', 'c2val', 'c3val'),

('b', 'c2val', 'c3val'),

('c', 'c2val', 'c3val'),

('d', 'c2val', 'c3val'),

('e', 'c2val', 'c3val'),

('f', 'c2val', 'c3val'),

('g', 'c2val', 'c3val'),

('h', 'c2val', 'c3val');

However, if I intend to

`insert`

`table`

`insert`

`select`

`insert into t1(c1, c2, c3)`

select ('a', 'b', 'c', 'd', 'e', 'f', 'g', 'h') as c1, t2.c2, t2.c3

from t2

where t2.c2 > t2.c3;

Instead, I have(

`insert into t1(c1, c2, c3)`

select 'a' as c1, t2.c2, t2.c3

from t2

where t2.c2 > t2.c3;

insert into t1(c1, c2, c3)

select 'b' as c1, t2.c2, t2.c3

from t2

where t2.c2 > t2.c3;

insert into t1(c1, c2, c3)

select 'c' as c1, t2.c2, t2.c3

from t2

where t2.c2 > t2.c3;

insert into t1(c1, c2, c3)

select 'd' as c1, t2.c2, t2.c3

from t2

where t2.c2 > t2.c3;

insert into t1(c1, c2, c3)

select 'e' as c1, t2.c2, t2.c3

from t2

where t2.c2 > t2.c3;

insert into t1(c1, c2, c3)

select 'f' as c1, t2.c2, t2.c3

from t2

where t2.c2 > t2.c3;

insert into t1(c1, c2, c3)

select 'g' as c1, t2.c2, t2.c3

from t2

where t2.c2 > t2.c3;

insert into t1(c1, c2, c3)

select 'h' as c1, t2.c2, t2.c3

from t2

where t2.c2 > t2.c3;

I had to write a LOT of this kind of stuff today and I wonder whether I could have done better with using the values as a set instead of writing an

`insert`

`select`

EDIT:

'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h' is not my actual data, which is in fact quite ugly and random. The letters were used solely as an example and we should not rely on their particular attributes.

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Answer Source

not really sure what the issue is, would this work?

```
insert into t1(c1, c2, c3)
select c1, c2, c3
from
(select
c2, c3
from
t2
where c2 > c3) cross join
(select 'a' as c1 union
select 'b' union
select 'c' union
select 'd' union
select 'e' union
select 'f' union
select 'g' union
select 'h' ) a
```

are you asking how to create a set given a bunch of ugly and random values? If so, you can either put them in a table or just `union`

them together.

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