how to nvl in sql?
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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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['Click "Start," type "cmd" (omit the quotation marks here and throughout) into the search box and press "Enter."', 'Type "SQLCMD -L" at the command prompt to bring up a list of SQL Servers running on your network.', 'Type "CONNECT (server name)" at the command prompt.']
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['(INNER) JOIN: Returns records that have matching values in both tables.', 'LEFT (OUTER) JOIN: Returns all records from the left table, and the matched records from the right table.', 'RIGHT (OUTER) JOIN: Returns all records from the right table, and the matched records from the left table.']
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NVL(expr1, expr2) : In SQL, NVL() converts a null value to an actual value. Data types that can be used are date, character and number. Data type must match with each other i.e. expr1 and expr2 must of same data type. expr1 is the source value or expression that may contain a null.
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['Data Definition Language (DDL) Statements.', 'Data Manipulation Language (DML) Statements.', 'Transaction Control Statements.', 'Session Control Statements.', 'System Control Statement.', 'Embedded SQL Statements.']
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['SQL Server INNER JOIN (or sometimes called simple join)', 'SQL Server LEFT OUTER JOIN (or sometimes called LEFT JOIN)', 'SQL Server RIGHT OUTER JOIN (or sometimes called RIGHT JOIN)', 'SQL Server FULL OUTER JOIN (or sometimes called FULL JOIN)']
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['Inner Join.', 'Left Outer Join.', 'Right Outer Join.', 'Text Join.', 'Referential Join.', 'Temporal Join.']
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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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['Numeric Types. TINYINT (1-byte signed integer, from -128 to 127) SMALLINT (2-byte signed integer, from -32,768 to 32,767) ... ', 'Date/Time Types. TIMESTAMP. DATE.', 'String Types. STRING. VARCHAR. ... ', 'Misc Types. BOOLEAN. ... ', 'Complex Types. arrays: ARRAY<data_type>']
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Introduction to Oracle NVL() function The Oracle NVL() function allows you to replace null with a more meaningful alternative in the results of a query. The NVL() function accepts two arguments. If e1 evaluates to null, then NVL() function returns e2 . If e1 evaluates to non-null, the NVL() function returns e1 .
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['Input: A query written in SQL is given as input to the query processor. ... ', 'Step 1: Parsing. ... ', 'Step 2: Translation. ... ', 'Step 3: Optimizer. ... ', 'Step 4: Execution Plan. ... ', 'Step 5: Evaluation. ... ', 'Output:']
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['Locate the query in the Navigation Pane.', 'Do one of the following: Double-click the query you want to run. Click the query you want to run, then press ENTER.', 'When the parameter prompt appears, enter a value to apply as a criterion.']
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['In SQL Server Management Studio, connect to an instance of the SQL Server Database Engine.', 'Expand Databases.', 'Right-click a database.', 'Point to Tasks.', 'Click one of the following options.']
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['MySQL INNER JOIN (or sometimes called simple join)', 'MySQL LEFT OUTER JOIN (or sometimes called LEFT JOIN)', 'MySQL RIGHT OUTER JOIN (or sometimes called RIGHT JOIN)']
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['Extract plv8. zip and cd into it.', 'sudo apt-get install subversion.', 'sudo make static.', 'Copy plv8.so to /usr/lib/postgres/9.1/lib.', 'Copy plv8--(version).sql and plv8.control to /usr/share/postgres/9.1/extension.', 'psql -d dbName.', 'CREATE EXTENSION plv8;', 'Repeat 6-8 for plls (livescript) and plcoffee (coffeescript) if required.']
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['The most efficient (using over()). select Grade, count(*) * 100.0 / sum(count(*)) over() from MyTable group by Grade.', 'Universal (any SQL version). select Grade, count(*) * 100.0 / (select count(*) from MyTable) from MyTable group by Grade;', 'With CTE, the least efficient.']
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['OR in the Join Predicate/WHERE Clause Across Multiple Columns. SQL Server can efficiently filter a data set using indexes via the WHERE clause or any combination of filters that are separated by an AND operator. ... ', 'Over-Indexing a Table. ... ', 'Under-Indexing a Table. ... ', 'No Clustered Index/Primary Key.']