Difference between Select Single and Select up to 1 rows in SAP ABAP

What is the difference between Select Single and Select up to 1 rows in SAP ABAP ?

These statements are the part of reading data from database table.
By using SELECT SINGLE and SELECT UPTO 1 ROWS we can able to read single record from a database table .

 Look at a glance below table:


SELECT SINGLE
SELECT UP TO 1 ROWS
Used to read exact record from database table.

Used to read appropriate record from database table.
To read exact record from database table we need to provide all key fields.
We can read appropriate record from database table, we may not need to provide all key fields.
This statement should be used only if all the key fields are available.

This statement should be used only if we have some key fields or no key fields.
How to Write:
SELECT SINGLE * FROM Table_Name INTO WA WHERE ALL KEY FIELDS
For performance this is better than select upto statement.
How to Write:
SELECT * FROM Table_name INTO WA UP TO 1 ROWS WHERE ALL KEY FIELDS/SOME FIELDS.
ENDSELECT.
From effective performance this is slow.
 

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