I have two tables and want to compare rows on sqlite like this
table1 table2
field1 field1
a a
b d
c f
d g
e
f
g
h
i
and I want to produce result like this
result_table
field1
b
c
e
h
i
How is the syntax in sqlite?
Thanks
SELECT DISTINCT Field1
FROM Table1
WHERE Field1 Not IN
(SELECT DISTINCT Field1 FROM Table2)
SELECT columns1 FROM table1 EXCEPT SELECT columns2 FROM table2;
The SQLite EXCEPT clause returns all rows from the left SELECT statement that are not in the result of the second SELECT statement. The number of columns selected must be the same in both SELECT statements.
This works fine for small to medium size tables. Avoid for tables with millions of lines.
See Compound Select Statements and the documentation of the SQLite SELECT statement.
Related
I have multiple SELECT queries which is ran against different tables.
The output of all the queries have the same number of rows (every query when ran individually will have the same number of rows). Is there a way I can combine the output of all these queries into a single result? (Keep out from first query and add the output of next query as a column to the output of the next query). I dont want to save these tables into database as I am just doing some validation testing.
Example:
SELECT AAA,BBB,CCC FROM Table1
SELECT Table2.DDD, Table1.AAA
FROM Table2
INNER JOIN Table1
ON Table1.AAA = Table2.AAA
I tried writing combining the query as
SELECT Table1.AAA,Table1.BBB,Table1.CCC,T1.DDD
FROM Table1,
(SELECT Table2.DDD, Table1.AAA
FROM Table2
INNER JOIN Table1
ON Table1.AAA = Table2.AAA)T1
I tried doing the above combined query, but instead of getting 11 rows as output (both queries above had result of 11 rows), I am getting 35 rows as output.
Hope the question made sense!
You'll need to specify a criteria to match each row the first query with which row of the second query.
If, for example, the column AAA is unique in both queries and you want to match rows with the same values you could do:
select a.*, b.*
from (
SELECT AAA,BBB,CCC FROM Table1
) a
full join join (
SELECT Table2.DDD, Table1.AAA
FROM Table2
INNER JOIN Table1
ON Table1.AAA = Table2.AAA
) b on b.aaa = a.aaa
If there aren't any clear matching rules, you can produce an artificial row number on each result set and use it to match rows. For example:
select
a.aaa, a.bbb, a.ccc,
b.ddd, b.aaa
from (
SELECT AAA, BBB, CCC,
row_number() over(order by aaa) as rn
FROM Table1
) a
full join join (
SELECT Table2.DDD, Table1.AAA,
row_number() over(order by table1.aaa, table2.ddd) as rn
FROM Table2
INNER JOIN Table1
ON Table1.AAA = Table2.AAA
) b on b.rn = a.rn
If you have several results and want to have all of them as additional columns you can simply use ",":
create table temp1 as select '1' as c1 from DUAL;
create table temp2 as select '2' as c2 from DUAL;
create table temp3 as select '3' as c3 from DUAL;
select a.c1, b.c2, c.c3 from temp1 a, (select c2 from temp2) b, (select c3 from temp3) c;
An alternative could also be that you want to have all the results as additional rows then you would use UNION ALL between the individual results.
Two different queries, produce two different result set.
Query 1:
Select a.customer_name, b.salary, c.manager_name
from
table123 a
left join table456 b on a.id=b.id
left join table789 c on a.id=c.id
Query2:
Select d.prty_id, e.party_val, f.prty_nme
from
table111 d
Left join table222 e on d.id=e.id
Left join table333 f on d.id=f.id
Now I have to write one single query, which will merge this above two query's result set and display one single result set.
Can anyone please help me on this.
Output value I need to insert in a new table whose column will be like below:
customer_name salary manager_name prty_id party_val prty_nme
According to your expected result, you can use UNION or UNION ALL.
The Oracle UNION operator is used to combine the result sets of 2 or more Oracle SELECT statements. It removes duplicate rows between the various SELECT statements.
The Oracle UNION ALL operator is used to combine the result sets of 2 or more SELECT statements. It returns all rows from the query and it does not remove duplicate rows between the various SELECT statements.
Select con1,... , coln
from tab1
where...
union
Select con1,... , coln
from tab2
where...
Just make sure your data types match up.
Table1: Columns A, B, C
Table2: Columns A, B, C
Table 2 is a copy of Table 1 with different data. Assume all columns to be varchar
Looking for a single efficient query which can fetch:
Columns A, B, C from Table1
Additional Rows from Table2 where values of Table2.A are not present in Table1.A
Any differences between the Oracle SQL & HQL for the same query will be appreciated.
I'm fiddling with Joins, Unions & Minus but not able to get the correct combination.
SQL:
SELECT *
FROM Table1
UNION ALL
SELECT *
FROM Table2 T2
WHERE NOT EXISTS(
SELECT 'X' FROM Table1 T1
WHERE T1.A = T2.A
)
HQL:
You must execute two different query an discard the element by Table2 result in a Java loop because in HQL doesn't exist UNION command.
Alternatatively you can write the first query for Table1 and the second query must have a not in clause to discard Table1 A field.
Solution 1:
Query 1:
SELECT * FROM Table1
Query 2:
SELECT * FROM Table2
and then you apply a discard loop in Java code
Solution 2:
Query 1:
SELECT * FROM Table1
Query 2:
SELECT * FROM Table2 WHERE Table2.A not in (SELECT Table1.A from Table1)
This query returns all rows in table1, plus all rows in table2 which does not exist in table1, given that column a is the common key.
select a,b,c
from table1
union
all
select a,b,c
from table2
where a not in(select a from table1);
There may be different options available depending on the relative sizes of table1 and table2 and the expected overlap.
I am writing a simple select statement to compare two different tables.
table 1 table 2
a a
b b
c c
H d
e
f
I need to select any item in table 1 that does not exist in table 2.
You have a few options, one of which is
select table1.col from table1 where
not exists (select col from table2 where table2.col = table1.col)
SELECT table_1.name
FROM table_1
LEFT JOIN table_2 ON table_1.name = table_2.name
WHERE table_2.name IS NULL
Subquery should do it:
Select * from table1
where Id not in
(select distinct col from table2)
Since it looks like there is only one column.
Try this.
select * from table a -- select all of the things in a
minus
select * from table b -- remove from it the things in b
If I run the two statements in batch will they return one table to two to my sqlcommand object with the data merged. What I am trying to do is optimize a search by searching twice, the first time on one set of data and then a second on another. They have the same fields and I’d like to have all the records from both tables show and be added to each other. I need this so that I can sort the data between both sets of data but short of writing a stored procedure I can’t think of a way of doing this.
Eg. Table 1 has columns A and B, Table 2 has these same columns but different data source. I then wan to merge them so that if a only exists in one column it is added to the result set and if both exist it eh tables the column B will be summed between the two.
Please note that this is not the same as a full outer join operation as that does not merge the data.
[EDIT]
Here's what the code looks like:
Select * From
(Select ID,COUNT(*) AS Count From [Table1]) as T1
full outer join
(Select ID,COUNT(*) AS Count From [Table2]) as T2
on t1.ID = T2.ID
Perhaps you're looking for UNION?
IE:
SELECT A, B FROM Table1
UNION
SELECT A, B FROM Table2
Possibly:
select table1.a, table1.b
from table1
where table1.a not in (select a from table2)
union all
select table1.a, table1.b+table2.b as b
from table1
inner join table2 on table1.a = table2.a
edit: perhaps you would benefit from unioning the tables before counting. e.g.
select id, count() as count from
(select id from table1
union all
select id from table2)
I'm not sure if I understand completely but you seem to be asking about a UNION
SELECT A,B
FROM tableX
UNION ALL
SELECT A,B
FROM tableY
To do it, you would go:
SELECT * INTO TABLE3 FROM TABLE1
UNION
SELECT * FROM TABLE2
Provided both tables have the same columns
I think what you are looking for is this, but I am not sure I am understanding your language correctly.
select id, sum(count) as count
from (
select id, count() as count
from table1
union all
select id, count() as count
from table2
) a
group by id