Firebird CTE result dataset with insert statement - sql

Question

I do have the difficulties with the following code I couldn't find where to place the insert statement in that code where it will insert the returned values from the CTE.
insert into ntm (num,comb,0,0,0,0,0,0,0,0,0,0,0,0)
with CTE as (
SELECT a.ELM_NUM as num,
a.N_1 as N1,
(trim('1.4*'||a.COMBO)||' + ' || '1.6*'||b.COMBO) as com2,
b.ELM_NUM as num2
FROM NTM a cross join ntm b
where ((a.Combo='dead' and b.combo='live') or (a.Combo='dead' and b.combo='live')) and a.ELM_NUM=b.ELM_NUM)
select num, num2, trim(trim(com2)||' + '||trim(d.combo)), N1, 1.4*N1
from CTE cross join ntm d
where (d.elm_num = cte.num) and (position('X',combo)>0 or position('Y',combo)>0 )
error raised by FlameRobin Engine "Token unknown - line 1, column 27
0
CREATE TABLE NTM
(
ELM_NUM Integer NOT NULL,
COMBO Char(40) NOT NULL,
N_1 Double precision,
N_2 Double precision,
V2_1 Double precision,
V2_2 Double precision,
V3_1 Double precision,
V3_2 Double precision,
M2_1 Double precision,
M2_2 Double precision,
M3_1 Double precision,
M3_2 Double precision,
MT_1 Double precision,
MT_2 Double precision
);

Answer 1

You can insert the result of an select statement by adding INSERT INTO <table> (<column>[, <column>]*) before the select statement (including the WITH). So If you have a query:
WITH a AS (
SELECT 4 AS ID, 'Item 4' AS NAME FROM RDB$DATABASE
)
SELECT ID, NAME
FROM a
And you want to insert into a table ITEMS with columns ID and NAME:
INSERT INTO ITEMS (ID, NAME)
WITH a AS (
SELECT 4 AS ID, 'Item 4' AS NAME FROM RDB$DATABASE
)
SELECT ID, NAME
FROM a
This works on Firebird 2.5, but I assume it also works in Firebird 2.1.
Based on your edit:
Your syntax is simply wrong: insert into ntm (num,comb,0,0,0,0,0,0,0,0,0,0,0,0) is invalid: you don't have a columns num and comb in table ntm, and specifying 0 as a column name is illegal. It seems you are confusing the INSERT columnlist with a value-list.
The syntax of an INSERT is:
INSERT INTO <object> [(col [, col …])]
{VALUES (<val> [, <val> …]) | <select_expr>}
You try to use something like:
INSERT INTO <object> (<val> [, <val> …])
<select_expr>
Assuming you only want to insert the num (into ELM_NUM) and the trim(trim(com2)||' + '||trim(d.combo)) (into COMBO) columns from your select, you should use:
insert into ntm (ELM_NUM,COMBO)
with CTE as (
SELECT a.ELM_NUM as num,
a.N_1 as N1,
trim('1.4*'||a.COMBO)||' + ' || '1.6*'||b.COMBO as com2,
b.ELM_NUM as num2
FROM NTM a cross join ntm b
where (a.Combo='dead' and b.combo='live' or a.Combo='dead' and b.combo='live') and a.ELM_NUM=b.ELM_NUM
)
select num, trim(trim(com2)||' + '||trim(d.combo))
from CTE cross join ntm d
where d.elm_num = cte.num and (position('X',combo) > 0 or position('Y',combo) > 0)
Note that I removed the other columns from the select as you are not inserting those (the number of columns in the select list must match the number of columns in the insert column list).
If you want the remaining columns to be 0, you either need to add a DEFAULT 0 to the table definition, or you need to list all columns and add a 0 value in your select list for each of those additional columns.