The main reason why I need it is that such functionality is quite hard to simulate other way. The following function call: NVL (e1, e2) is equivalent to . The DECODE function is not specifically for handling null values, but it can be used in a similar way to the NVL function, as shown by the following example. Sr. QA Manager . This Oracle tutorial explains how to use the Oracle IS NULL condition with syntax and examples. The following example returns the second … techtutorialsx. We… Skip to content. A site about programming, IoT and technology.
The objective of this post is to explain how to obtain the least and the greatest values across the columns of a table, in Oracle SQL. Oracle NVL() and CASE expression. Hi, I'm looking for a function in T-SQL for getting the biggest or the smallest value between two or more columns (like GREATEST function of Oracle or MINDATE/MAXDATE in Firebird)
The NVL() function is similar to the CASE expression when it comes to test a value for NULL. The Oracle IS NULL condition is used to test for a NULL value. You can use the CASE expression to rewrite the query that returns order id and salesman as follows: SELECT order_id, CASE WHEN first_name IS NOT NULL THEN … SQL> SELECT id, DECODE(col1, NULL, 'ZERO', col1) AS output FROM null_test_tab ORDER BY id; ID OUTPUT ----- ----- 1 ONE 2 ZERO 3 ZERO 4 ZERO 4 rows selected. As of 5.0.13, it returns NULL if any argument is NULL. SUMMARY: This article discusses the conditional expressions GREATEST and LEAST in PostgreSQL and gives … Description: The old GREATEST() and LEAST() behavior was exactly what I am looking for: Before MySQL 5.0.13, LEAST() returns NULL only if all arguments are NULL. Tushar Ahuja. Data Adapters Transparent data integration for Postgres-based solutions. Find tutorials for many different … Oracle NVL2() function examples. Let’s take some examples of using the Oracle NVL2() function to understand how it works.. A) Oracle NVL2() function with numeric data type example. SQL> NVL2 Back to Postgres Tutorials. CASE WHEN e1 IS NOT NULL THEN e1 ELSE e2 END. December 30, 2019. The following statement returns two because the first argument is null. Native compatibility with Oracle database. If one of the arguments is null, it returns null. I wonder why this was changed - for compatibility? Introduction The objective of this post is to explain how to obtain the least and the greatest values across the columns of a table, in Oracle SQL. You can use the Oracle IS NULL condition in either a SQL statement or in a block of PLSQL code. Tushar Ahuja. This matches what the least operator does in Oracle and MySQL, but differs from Postgres. But this armouring against null makes it more verbose (if you know they won't be null, a plain case when @a <= @b then @a else @b end would work). Examples of using GREATEST and LEAST functions in PostgreSQL. SELECT NVL2(NULL, 1, 2) -- 2 FROM dual; B) Oracle NVL2() function with character data type example.