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11 Νοε 2014 · Let's look at some Oracle NVL function examples and explore how to use the NVL function in Oracle/PLSQL. For example: SELECT NVL(supplier_city, 'n/a') FROM suppliers;
The syntax for the DECODE function is as follows: DECODE(expression, search1, result1, [search2, result2, ...], [default]) Parameters: expression: The value or column to be evaluated. searchN: The search value to compare with the expression.
7 Αυγ 2021 · DECODE is a function-based equivalent of a CASE statement. Your code is the equivalent of: Select CASE DECODE(NVL(tab.id,0),0,0,1) + DECODE (NVL(tab2.id,0),0,0,1), WHEN 2 THEN 'two'. WHEN 0 THEN 'none'. ELSE DECODE(DECODE (NVL(tab2.id,0),0,0,1),1,'one','NA') END AS Result.
The Oracle NVL() function allows you to replace null with a more meaningful alternative in the results of a query. The following shows the syntax of the NVL() function: NVL(e1, e2) Code language: SQL (Structured Query Language) ( sql )
DECODE compares expr to each search value one by one. If expr is equal to a search, then Oracle Database returns the corresponding result. If no match is found, then Oracle returns default. If default is omitted, then Oracle returns null.
The DECODE, NULLIF, NVL, and NVL2 functions, however, do not solve a specific problem; rather, they are best described as inline if-then-else statements. These functions are used to make decisions based on data values within a SQL statement without resorting to a procedural language like PL/SQL.
NVL. The NVL function allows you to replace null values with a default value. If the value in the first parameter is null, the function returns the value in the second parameter. If the first parameter is any value other than null, it is returned unchanged.
