Let's say i have Datatable1 that has "Colum1" , "colum2"
and another table, Datatable2 with "Colum3" , "colum4"
I need to create Datatable3 that will contain all the columns "Colum1" , "colum2", "Colum3" , "colum4"
I need something smart, like the DefaultView.ToTable() method that does it for one table.
Thanks
As you didn't mention any language or DB server type, here's something that might work (not tested really) on SQL Server 2005:
CREATE TABLE #temp (col1 <type>, col2 <type>, col3 <type>, col4 <type>)
INSERT INTO #temp
(
SELECT t1.Column1, t1.Column2, t2.Column3, t2.Column4
FROM Datatable1 t1 INNER JOIN Datatable2 t2 ON t2.<PrimaryKeyField> = t1.<PrimaryKeyField>
UNION
SELECT t1.Column1, t1.Column2, t2.Column3, t2.Column4
FROM Datatable2 t2 INNER JOIN Datatable1 t1 ON t1.<PrimaryKeyField> = t2.<PrimaryKeyField>
)
SELECT * FROM #temp
Related
This question is wrong. I had some very big misunderstanding about how union works. I am reading about it now.
edit 04.12.2016
If you are still intersted, you can go here
Selecting the right column
I have something like this
with table3 as
(
select t1.c1, t1.c2...
from table1 t1
union all
select t2.c1, t2.c2...
from table2 t2
)select * from table3
I need to insert all rows from above in another table
insert into table4 t4
(
t4.c1, t4.c2...
)
select t3.c1, t3.c2...
from table3 t3
My question is, will this insert work. I have clumns in table 1 and 2 named the same, will I need to reference them somehow differently?
Do I need to write it like this?
insert into table4 t4
(
t4.c1, t4.c2...
)
select t3.t1.c1, t3.t1.c2, t3.t2.c1...
from table3 t3
with is part of select statement. You can insert result of select and you can use with in this select. Maybe syntax is not the most intuitive but this should work:
insert into table4
with table3 as
(
select t1.c1, t1.c2...
from table1 t1
union all
select t2.c1, t2.c2...
from table2 t2
) select * from table3;
And no you don't need (even can't) use double aliases.
No alias needed
if the column match you could simply use insert select
insert into table4
( select t1.c1, t1.c2...
from table1 t1
union all
select t2.c1, t2.c2...
from table2 t2)
otherwise you should declare the column name
insert insert into table4(c1, c2... )
( select t1.c1, t1.c2...
from table1 t1
union all
select t2.c1, t2.c2...
from table2 t2)
Assuming that you needto use that UNION ALL, instead of single insert-as-select statements to insert into another table, you can try to use different aliases for columns from different tables:
with table1 as
(
select t2.name as t2_name,
t2.address as t2_address,
t2.age as t2_age,
null as t3_name,
null as t3_address,
null as t3_age,
from table2 t2
union all
select null,
null,
null,
t3.name,
t3.address,
t3.age
from table3 t3
)
Have 2 tables with same columns and want to generate the difference between the tables and want to show the difference listing all columns from both tables
example:
select a.*,b.* from (
(
select a.col1,a.col2 from
(select col1, col2 from table1 minus select col1, col2 from table2) as a
)
union
(
select b.col1, b.col2 from
(select col1, col2 from table2 minus select col1, col2 from table2) as b
)
)
The result should be
a.col1 a.col2 b.col1 b.col2
a.FName a.ZipCode b.FName b.ZipCode
John <same value> Jane <same value as A>
Alpha 1234 Beta 2345
My query returns exception that it is missing R parenthesis after the 1st minus keyword
I think you are trying to find rows from table a which are missing in table b and rows in table b which are missing from table a. However, there is no point in joining these two sets. Try the following query and see if it works for you.
SELECT col1, col2, 'Missing from table 2' title
FROM
(
SELECT col1,
col2
FROM table1
MINUS
SELECT col1,
col2
FROM table2
)
UNION ALL
SELECT col1, col2, 'Missing from table 1' title
FROM
(
SELECT col1,
col2
FROM table2
MINUS
SELECT col1,
col2
FROM table1
)
I just recently found out that subqueries are not allowed in INSERT statements that are inside stored procedures. This is my script:
begin
execute immediate 'truncate table itcustadm.GL_DTPJ_TEST2';
insert into GL_DTPJ_TEST2
(rule_no,
posted_by_user_id,
transaction_id,
transaction_sr_no,
dr_amount,
cr_amount,
tran_crncy_code,
bkdt_tran_flg,
bank_desc
)
select
tq.rule_no,
tq.posted_by_user_id,
tq.transaction_id,
tq.transaction_sr_no,
tq.dr_amount,
tq.cr_amount,
tq.tran_crncy_code,
tq.bkdt_tran_flg,
(select ent.bank_desc from crmuser.end ent where ent.bank_id = gam.bank_id);
But since the (select ent.bank_desc from crmuser.end ent where ent.bank_id = gam.bank_id) at the bottom of the SELECT statement is not allowed by Oracle, what's the best way to accomplish this?
I actually have this code right before the INSERT statement, but I don't know how to exactly use it:
get_bank_desc := '(select ent.bank_desc from crmuser.end ent ' ||
'where ent.bank_id = gam.bank_id)';
I am not sure what you are exactly trying for, but below code may be useful for you, you can achieve inserting a SubQuery output into a table using below query sample, but make sure output of the SubQuery is a single row o/p, so that you can escape from "ORA-01427: single-row SubQuery returns more than one row" ERROR.
insert into test_ins1
values(1,(SELECT COL2 FROM TEST_INS WHERE COL1=1 ));
Even then you can use rownum in where condition and take the single value.
Please let me know in case of any doubts
declare
bank_desc_temp bank_desk_type; /* the type defined in crmuser.ent for bank_desc*/
begin
select ent.bank_desc into bank_desc_temp from crmuser.end ent where ent.bank_id = gam.bank_id;
execute immediate 'truncate table itcustadm.GL_DTPJ_TEST2';
insert into GL_DTPJ_TEST2
(rule_no,
posted_by_user_id,
transaction_id,
transaction_sr_no,
dr_amount,
cr_amount,
tran_crncy_code,
bkdt_tran_flg,
bank_desc
)
select
tq.rule_no,
tq.posted_by_user_id,
tq.transaction_id,
tq.transaction_sr_no,
tq.dr_amount,
tq.cr_amount,
tq.tran_crncy_code,
tq.bkdt_tran_flg,
bank_desc_temp;
end;
When you say "not allowed" what do you mean? Did you get an error?
I ask, because subqueries are definitely allowed inside an insert as select statement, providing you have the syntax correct (and the subquery returns at most one row), e.g.:
create table test_tab (col1 number, col2 varchar2(10));
begin
insert into test_tab
select 1,
(select 'Yes' from dual d2 where d.dummy = d2.dummy)
from dual d;
commit;
end;
/
select * from test_tab;
COL1 COL2
---------- ----------
1 Yes
There are some syntax issues with the code you provided - where is the from clause, and where are the tq and gam aliases defined?
There are two syntax you can use in your insert statement:
(I)
INSERT INTO table_name( column1, column2....columnN)
VALUES ( value1, value2....valueN);
(II)
INSERT INTO table (column1, column2, ... )
SELECT expression1, expression2, ...
FROM source_table(s)
WHERE conditions;
In your example, you should choose the second approach:
insert into GL_DTPJ_TEST2 (rule_no,
posted_by_user_id,
transaction_id,
transaction_sr_no,
dr_amount,
cr_amount,
tran_crncy_code,
bkdt_tran_flg,
bank_desc
)
select tq.rule_no,
tq.posted_by_user_id,
tq.transaction_id,
tq.transaction_sr_no,
tq.dr_amount,
tq.cr_amount,
tq.tran_crncy_code,
tq.bkdt_tran_flg,
ent.bank_desc
from crmuser.gam
join crmuser.end ent
on ent.bank_id = gam.bank_id
;
basically, if you want to add records using an insert statement, you should use a full select statement first. Here is how I would do it:
(1)
select *
from table1;
(2)
select column1
,column2
,column3
from table1;
(3)
select t1.column1
,t1.column2
,t1.column3
,t2.column4
,t2.column5
from table1 t1
join table2 t2
on t2.id = t1.id
;
(4)
insert into table3 (col1
,col2
,col3
,col4
,col5)
select t1.column1
,t1.column2
,t1.column3
,t2.column4
,t2.column5
from table1 t1
join table2 t2
on t2.id = t1.id
;
I am using SQL Server 2012. I have a table called table1 like below:
Id col1 col2 col3 Name
1 a b abc null
2 b c mno null
And I have another table table2, like below:
Id col1 col2 col3 Name
1 % % abc Name1
2 a % abc Name2
3 % b abc Name3
4 a b abc Name4
I have to update Name column in Table1 From Name column in Table2 based on columns: col1, col2 and col3.
The Id = 1 in the table1 finds all 4 matches in the table because I am using like operator in col1 and col2 to compare(why I am using like is if it didn't find exact match it should accept % as a match).
Now my problem is if exact match is there for the columns col1, col2 and col3 in the table, it should consider that only not the rows with '%' value. For example, for the Id=1 in the table1, the result should be from id=4 in the table2.
I tried with following query:
UPDATE table1
SET name = t2.Name
FROM (SELECT TOP 1
t1.id, t2.name
FROM table1 t1
INNER JOIN table2 t2
ON t1.col3 = t2.col3 AND t1.col1 LIKE t2.col1
AND t1.col2 LIKE t2.col2
ORDER BY t2.col1, t2.col2) AS t3
WHERE id = t3.id;
But I am not getting result which I expected. And also, there are 8,000,000 records are there in table1 so it should not affect performance.
Please help to fix this issue.
At a first try, I suggest this:
UPDATE table1
SET name = t2.Name
FROM (SELECT TOP(1) *
FROM (SELECT
t1.id, t2.name, t2.col1, t2.col2, 2 As ord
FROM table1 t1
INNER JOIN table2 t2
ON t1.col3 = t2.col3 AND t1.col1 LIKE t2.col1
AND t1.col2 LIKE t2.col2
UNION ALL
SELECT
t1.id, t2.name, t2.col1, t2.col2, 1 As ord
FROM table1 t1
INNER JOIN table2 t2
ON t1.col3 = t2.col3 AND t1.col1 = t2.col1
AND t1.col2 = t2.col2
) DT
ORDER BY ord, col1, col2) AS t3
WHERE id = t3.id;
I have a table which doesnot have any unique key column and I want to perform bulk update using self join.
Update
(
select t1.Col1 col1, t2.col1 col2
from table t1
inner join table t2 on <join condtn>
where <condtn>
)
Set col1 = col2
but as the table does not have unique key column, it gives error:
ORA-01779: cannot modify a column which maps to a non key-preserved
table.
Is there any solution other than adding unique constraint :)
You should be able to refactor the query to do a correlated update
UPDATE table t1
SET col1 = (SELECT col1
FROM table t2
WHERE t1.<<some column>> = t2.<<some column>>)
WHERE EXISTS( SELECT 1
FROM table t2
WHERE t1.<<some column>> = t2.<<some column>>)