How to Get the Unmatched Records from Two Tables Using Joins

How to join tables selecting both matched and unmatched records?

I think you need a full join and coalesce:

SELECT COALESCE(t1.pl, t2.pl) AS pl
, COALESCE(t1.sta, t2.sta) AS sta
, COALESCE(t1.count_1, 0) AS count_1
, COALESCE(t2.count_2, 0) AS count_2
FROM t1
FULL JOIN t2 ON t1.pl = t2.pl AND COALESCE(t1.sta, -99) = COALESCE(t2.sta, -99)

In order to account for cases where sta is NULL, replace sta with -99 or some other value that is otherwise invalid.

Select unmatched records from two tables with a filter on second table

Move the conditions involving table b from WHERE to ON clause:

SELECT a.ID, a.Description 
FROM a
LEFT JOIN b ON a.ID = b.ID AND b.Room = '101'
WHERE a.Inactive = 0
AND b.ID Is Null

It'll find rows where a does not have a match in b (id matches and room number = 101).

Join two tables to get matching records and unmatched records from Table 1

I think this might do what you want:

select P.CoverageProductID, P.CName, P.CType
from Product P
where exists (select 1
from coverage c
where p.CoverageProductID = c.CoverageProductID)
union all
select C.CoverageProductID, C.CName, C.CType
from Coverage C
where not exists (select 1
from product p
where p.CoverageProductID = c.CoverageProductID);

It gets all rows from Product that match in Coverage and then all rows from Coverage that don't have a match in Product.

Find unmatched records

Try a LEFT OUTER JOIN:

SELECT * FROM forms 
LEFT OUTER JOIN records
ON forms.form_id = records.form_id
WHERE records.form_id IS null

Join two tables to get matching records alongside with unmatched records

Use a cross join to generate the rows and a left join to bring in the values:

select n.*, e.type, coalesce(em.value, 0) as value
from (select distinct firstname, lastname from employee) n cross join
expenditure e left join
employee em
on em.firstname = n.firstname and em.lastname = n.lastname and
em.ExpenditureID = e.ExpenditureID;

Aggregation does not seem necessary but might be if you have multiple rows that need to be s summed together. Your sample data has no such examples.

Here is a db<>fiddle.

How to fetch unmatching records from two SQL tables?

I think joeslice's answer will only give half the results. You need to union the other table. Alternatively, you could do a full outer join.

select a.Id, a.Name from Table1 a left outer join Table2 b on a.Name = b.Name where b.Id is null
UNION ALL
select a.Id, a.Name from Table2 a left outer join Table1 b on a.Name = b.Name where b.Id is null

How can I find all unmatched records across 2 tables in SQL?

Postgres is expecting you to use the defined table's alias:

SELECT * 
FROM recruiter r
WHERE NOT EXISTS (
SELECT * FROM recruiter_assigned_role rar
WHERE rar.recruiterUser = r.userId
)

MySQL Query Join to select unmatched rows from two tables

SELECT users.* 
FROM users
LEFT JOIN users_approval b
ON users.username = b.username AND
b.approved_id = "3B888F52-50BC-11E2-B08B-99E5B2CADDF7"
WHERE users.role_type = "student" AND
b.approved_id IS NULL
  • SQLFiddle Demo

How to fetch the unmatched records from two tables in Hive?

Use left join on dept_text table then filter only the null id columns from dept table

select dt.* from dept_text dt 
left join
dept d
on d.id=dt.id
where d.id is null;

Example:

desc dept;
--id int
--desc string
--city string

select * from dept;
--OK
--dept.id dept.desc dept.city
--10 ACCOUNTING NEW YORK
--20 RESEARCH DALLAS
--30 SALES CHICAGO
--40 OPERATIONS BOSTON

--if you want to join on desc column

select dt.* from dept_text dt
left join
dept d
on d.desc=dt.desc
where d.id is null;

--or if you want to join on id column

select dt.* from dept_text dt
left join
dept d
on d.id=dt.id
where d.id is null;


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