why we use nvl in oracle?
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In Oracle, the NVL function allows you to replace a NULL value with another value. It's helpful when you want to store the fact that there is no data for a particular column, but you want to display something else.
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NVL Function - Replace NULL - Oracle to SQL Server Migration. In Oracle, NVL(exp1, exp2) function accepts 2 expressions (parameters), and returns the first expression if it is not NULL, otherwise NVL returns the second expression. In SQL Server, you can use ISNULL(exp1, exp2) function.
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Oracle's National Language Support (NLS) architecture allows you to store, process, and retrieve data in native languages. It ensures that database utilities and error messages, sort order, date, time, monetary, numeric, and calendar conventions automatically adapt to the native language and locale.
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As to what the actual difference is between those two options - well that could go on to be a very long answer but essentially LVM deals with extents and has multiple additional layers of abstraction that clearly need to be considered during boot - whereas the standard Linux PT should be a lot more starightforward than ...
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NvCpl. dll is a library file for NVIDIA display adapter. It's loaded as a startup item, to load the Nvidia Control Panel and help to process the various files and information that Nvidia graphics cards use to help your computer run as smoothly as possible.
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PL/SQL (Procedural Language for SQL) is Oracle Corporation's procedural extension for SQL and the Oracle relational database. PL/SQL is available in Oracle Database (since version 6 - stored PL/SQL procedures/functions/packages/triggers since version 7), Times Ten in-memory database (since version 11.2.
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ASLR support was added to Windows more than a decade ago with the release of Windows Vista. As the name explains, the point of ASLR is to randomize the memory addresses used by executable code (including DLLs) so that an attacker who finds a memory flaw, such as a buffer overflow, can't easily exploit it.
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The cycle option will end up with error if you are using this sequence for the primary key values as it won't allow the duplicates. The oracle sequence by default creates with nocycle option. The nocycle option will give you an error message when you try to fetch next value after reaching the max value.
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NVM is an acronym that means never mind. It's often used as a hashtag.
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UPDATE test SET test1 = NVL(test1, 'hello'), test2 = NVL(test2, 'world') WHERE test2 IS NULL OR test1 IS NULL; Though it may fire your update triggers even for the rows that are effectively unchanged. COALESCE() works similarly to NVL() in this circumstance -- returning the first non-null value.
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A final example using the NVL function in Oracle/PLSQL is: SELECT NVL(commission, 0) FROM sales; This SQL statement would return 0 if the commission field contained a null value. Otherwise, it would return the commission field.
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1 - V$session is used on standalone database, an gv$session (g=global) is used mostly on RAC environments, showing all sessions on each node. 2 - maybe with something like this.
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A view is a virtual table because you can use it like a table in your SQL queries. ... And it is just a named query stored in the database. When you query data from a view, Oracle uses this stored query to retrieve the data from the underlying tables.
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ICNV is a configurable process that can be can be stopped and restarted. It allows for the conversion of large tables during system uptime. It is recommended that you execute ICNV as early as possible. ... SAP upgrades invariably lead to changes in the structure of database tables.
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['Oracle INNER JOIN (or sometimes called simple join)', 'Oracle LEFT OUTER JOIN (or sometimes called LEFT JOIN)', 'Oracle RIGHT OUTER JOIN (or sometimes called RIGHT JOIN)', 'Oracle FULL OUTER JOIN (or sometimes called FULL JOIN)']
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The Oracle NUMBER data type is used to store numeric values that can be negative or positive. The following illustrates the syntax of the NUMBER data type: NUMBER[(precision [, scale])] The Oracle NUMBER data type has precision and scale. The precision is the number of digits in a number.
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The NAND and NOR gates are universal gates. In practice, this is advantageous since NAND and NOR gates are economical and easier to fabricate and are the basic gates used in all IC digital logic families.