SQL EXCEPT Vs NOT IN Operator

To filter records from a table depending on a specified criterion, the EXCEPT and NOT IN operators are employed.

SQL Server 2005 introduces the EXCEPT operator. We'll look at these operators in depth in this post, as well as the differences between them.

SQL EXCEPT Operator

When there are no matching rows in the right query, the EXCEPT operator returns all of the distinct rows from the query to the left of the EXCEPT operator.

There are two requirements that must be met before the EXCEPT operator can be used.

Both searches must return the same columns in the same order and with the same amount of columns.

The column data types must match .

Example: Let's have a look at how the EXCEPT operator works.

CID	Name	Gender	City
C-1	Bala Murugan	Female	Pune
C-2	Varshini Kutty	Male	Mumbai

Let's look at table 2 Order

OrderNo	CID	Amount	OrderDate
1	C-2	1000	1999/10/18 14:17:42
2	C-2	8000	2005/09/15 19:17:37

The records with id 1 Column is common in the Customer and Order tables.

When the EXCEPT operator is used to entries from the Customer table on the left and the Order table on the right, only those records from the Customer table that are not in Order are returned.

Mysql,Sql-server,Sqlite

SELECT CID 
FROM Customer
EXCEPT
SELECT CID
FROM Order
ORDER BY CID;

Output: The output of which column not in table 2 is

cid
C-1

SQL NOT IN Operator

In its target lists, the NOT IN operator can have any number of phrases.

NOT IN will return all rows from the left hand side table that aren't in the right hand side table.

But it won't eliminate duplicate rows. Rows can also be filtered using the NOT IN Operator.

Example: Let's use the NOT IN operator to find all BID column from the Book table that are also present in the Order table and return the remainder of the records.

BID	BookName	Price
B-1	Securing Oracle	70
B-2	SQL Pocket Guide	179

Let's look at order table

OrderNo	BID	Qty	OrderDate
1	B-1	9	2005/07/26 19:30:51
2	B-1	2	1999/03/15 21:57:53

The following query we will compare BID column in both tables . This query return the output which record not in second column

Mysql, Sql-server,Sqlite,Ms access

SELECT BID, BookName FROM BO_Book
WHERE BID NOT IN (SELECT BID FROM BO_Order);

Output: The reuslt will be

bid	bookname
B-2	SQL Pocket Guide

SQL Difference Between NOT IN And EXCEPT Operato

There are 5 main distinguish in not in & except operator:-

EXCEPT	NOT IN
When there are no matching rows in the right query, the EXCEPT operator returns all of the distinct rows from the query to the left of the EXCEPT operator.	NOT IN will return all rows from the left hand side table that aren't in the right hand side table, but it won't eliminate duplicate rows.
The EXCEPT operator filters out duplicate rows and only returns `DISTINCT` data. Example : To filter all records from the Cars1 table that are present in the Cars2 table, use the EXCEPT operator. USE ShowRoom SELECT id, name, company, power FROM Cars1 Except SELECT id, name, company, power FROM Cars2	If you use the NOT IN operator, you'll get duplicate records.
The EXCEPT operator compares values in several columns. This necessitates the use of the same amount of columns. Consider the following scenario: For example, the queries on the left and right of an EXCEPT operator cannot contain an unequal number of columns, as seen in the following example: USE ShowRoom SELECT id, name, company, power FROM Cars1 Except SELECT id, name,power FROM Cars2	The NOT IN operator compares values from one column to another.
The EXCEPT operator is the Left Anti Semi Join's equivalent.	The NOT IN operator and the Left Anti Semi Join are not interchangeable.
In their target lists, the EXCEPT operator must have an equal number of expressions.	In its target lists, the NOT IN operator can have a varying amount of expressions.

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