sql - What are the NVL and the NVL2 functions in Oracle? How do …
Apr 29, 2016 · 1. Both the NVL (exp1, exp2) and NVL2 (exp1, exp2, exp3) functions check the value exp1 to see if it is null. With the NVL (exp1, exp2) function, if exp1 is not null, then the value of exp1 is returned; otherwise, the value of exp2 is returned, but case to the same data type as that of exp1. With the NVL2 (exp1, exp2, exp3) function, if exp1 is ...
sql - Oracle Differences between NVL and Coalesce - Stack Overflow
Jun 4, 2009 · The differences are: NVL accepts only 2 arguments whereas COALESCE can take multiple arguments. NVL evaluates both the arguments and COALESCE stops at first occurrence of a non-Null value. NVL does a implicit datatype conversion based on the first argument given to it. COALESCE expects all arguments to be of same datatype.
sql - Oracle NVL with empty string - Stack Overflow
select * from example_so where nvl (mycol, '') = ''; nvl (mycol, '') will be resulted as NULL and when you compared NULL with empty string it cant be compared. create table t(id varchar2(2)); insert into t values (nvl(null,'')); <------ this will insert NULL. insert into t values (nvl(null,'et')); answered Oct 9, 2014 at 10:22.
sql - Qual a diferença entre COALESCE e NVL - Stack Overflow em …
11. As diferenças são: COALESCE segue o padrão ANSI enquanto o NVL é específico do Oracle; NVL aceita apenas 2 agurmentos enquanto que COALESCE pode receber múltiplos argumentos; NVL executa ambos argumentos e COALESCE para na primeira ocorrência de um valor não-nulo; NVL faz uma conversão implícita do tipo de dado baseado no primeiro ...
sql - Function that is opposite of nvl - Stack Overflow
I was wondering if there is a function that acts as an opposite to the nvl function. Something like this: SET "function use if null"(review1,review2) = 'Yellow', "function use if null"(reason1,reason2) = 'Audit'. WHERE ACCOUNT = '11111111'. Essentially, the update would pick review2 if review1 is already populated.
oracle - How to use NVL in PL/SQL for Date columns? - Stack …
Nov 10, 2020 · I used NVL to handle the Table columns, but RleasedDate column depends on FromDate and To date input parameters. I tried to use NVL, but I am facing issues. I am receiving the data in mm/dd/rrrr format.
sql - Oracle DECODE vs. NVL - Stack Overflow
Nov 11, 2014 · The SQL statement above would return 'n/a' if the supplier_city field contained a null value. Otherwise, it would return the supplier_city value. Another example using the NVL function in Oracle/PLSQL is: SELECT supplier_id, NVL(supplier_desc, supplier_name) FROM suppliers; This SQL statement would return the supplier_name field if the supplier ...
SQL nvl equivalent - without if/case statements & isnull & coalesce
Jan 19, 2009 · Are there any nvl() equivalent functions in SQL? Or something close enough to be used in the same way in certain scenarios? UPDATE: no if statementsno case statementsno isnullno coalesce select ...
sql - Oracle: Mixing NVL with Outer Join - Stack Overflow
May 2, 2013 at 15:30. @Colin 't Hart :I'm not sure I follow your point. In the link you provided it says "Oracle recommends that you use the FROM clause OUTER JOIN syntax rather than the Oracle join operator", and old syntax has many restrictions, not vice verse. Internal conversions (if any) are part of implementation, and I doubt the second ...
oracle - How can i use NVL function while i insert a value for null …
Feb 11, 2013 · PL/SQL procedure successfully completed. SQL> select nvl2(:a, 'c', 'b') "nvl2", 2 case when :a is null then 'b' else 'c' end "case", 3 decode(:a, null, 'b', 'c') "decode". 4 from dual; n c d. - - -. b b b. so if you wanted the value as-is if not null, and something hard coded if its null then: