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8 mar 2021 · select jobs, nvl(salary, 0) as salary from your_table Or COALESCE. select jobs, coalesce(salary, 0) as salary from your_table Or DECODE. select jobs, decode(salary, null, 0, salary) as salary from your_table Or CASE. select jobs, case when salary is null then 0 else salary end as salary from your_table
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 )
15 mar 2006 · The problem here is not wheter null is or isn't equal to null. The problem here is that oracle treat zero-length strings as null. One of oracles annoyances (but reading your answer, it seems you have grown a blind spot :) ). dude, they have nulls in the column, therefore it is null.
23 lut 2012 · ASCII code 0 represents the "NUL" character, and can be entered using oracle's CHR () function [ chr (0) ]. The entered value can be tested with ascii () function (i.e. select * from tab where ascii (col) = 0). The "empty string" is not showing to have an ascii value of '0'. Only in C would '\0' be the emtpy string.
Nulls can appear in columns of any data type that are not restricted by NOT NULL or PRIMARY KEY integrity constraints. Use a null when the actual value is not known or when a value would not be meaningful. Oracle Database treats a character value with a length of zero as null.
31 paź 2020 · I have multiple tables in an Oracle schema that have columns with incorrect values: Number columns where the value is zero, instead of null. Text columns where the value is a space, instead of null. I’m in the process of cleaning up the data.
25 lis 2019 · Nulls are stored in the database if they fall between columns with data values. In these cases, they require 1 byte to store the length of the column (zero). Trailing nulls in a row require no storage because a new row header signals that the remaining columns in the previous row are null.
