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How is the except statement different from the not in statement?


Asked by Joe Carpenter on Dec 05, 2021 FAQ



There are two major differences: The EXCEPT statement only returns the distinct records, whereas a NOT IN statement returns all the records that are not filtered by the NOT IN statement In the EXCEPT statement, the comparison between two SELECT statements is based on all the columns in both the tables.
Indeed,
These statements tell Python what to do when an exception is encountered. This act of detecting and processing an exception is called exception handling. The syntax of the try…except statements is: If an exception occurs, a try block code execution is stopped and an except block code will be executed.
Next, The SQL EXCEPT statement returns those records from the left SELECT query, that are not present in the results returned by the SELECT query on the right side of the EXCEPT statement. A SQL EXCEPT statement works very similarly to the way that the minus operator does in mathematics. The EXCEPT statement was introduced in Microsoft SQL Server 2005.
Also,
The syntax of the try…except statements is: If an exception occurs, a try block code execution is stopped and an except block code will be executed. If no exception occurs inside the try block, the statements inside the except block will not be executed.
In respect to this,
NOT EXISTS compares two or more tables accoding to the conditions specified in WHERE clause in the sub-query following NOT EXISTS keyword. EXCEPT can be rewritten by using NOT EXISTS. (EXCEPT ALL can be rewritten by using ROW_NUMBER and NOT EXISTS.) There is no accounting for SQL server's execution plans.