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Articles by Arushi
Page 6 of 9
How can I customize value, instead of NULL, of a row by using MySQL IF() function?
Suppose in our ‘Employee’ table we are having NULL as the value of ‘salary’ column for two employees. The data, shown as follows, is itself not meaningful.mysql> Select * from employee; +----+--------+--------+ | ID | Name | Salary | +----+--------+--------+ | 1 | Gaurav | 50000 | | 2 | Rahul | 20000 | | 3 | Advik | 25000 | | 4 | Aarav | 65000 | | 5 | Ram | 20000 | | 6 | Mohan | 30000 | | 7 | Aryan | NULL | | 8 ...
Read MoreHow to Install C++ Compiler on Windows?
There are several alternatives for compiling C++ on windows. Let's look at 2 of them:GCCTo install GCC on Windows you need to install MinGW. To install MinGW, go to the MinGW homepage, www.mingw.org, and follow the link to the MinGW download page. Download the latest version of the MinGW installation program which should be named MinGW-.exe.While installing MinGW, at a minimum, you must install gcc-core, gcc-g++, Binutils, and the MinGW runtime, but you may wish to install more.Add the bin subdirectory of your MinGW installation to your PATH environment variable so that you can specify these tools on the command ...
Read MoreWhat is the resemblance of COALESCE() function with IF-THEN-ELSE statement?
As we know that COALESCE() function returns first non-NULL value from the list of values. The following IF-THEN-ELSE statement is equivalent to COALESCE() function.IF value1 is not NULL THEN output = value1; ELSIF value2 is not NULL THEN output = value2; ELSIF value3 is not NULL THEN output = value3; . . . ELSIF valueN is not NULL THEN output = valueN; ELSE output = NULL; END IF;
Read MoreJava ResultSet getDriverMajorVersion() method with example
When we execute certain SQL queries (SELECT query in general) they return tabular data.The java.sql.ResultSet interface represents such tabular data returned by the SQL statements.i.e. the ResultSet object holds the tabular data returned by the methods that execute the statements which quires the database (executeQuery() method of the Statement interface in general).The ResultSet object has a cursor/pointer which points to the current row. Initially this cursor is positioned before first row.The first() method of the ResultSet interface moves the pointer of the current (ResultSet) object to the first row, from the current position.This method returns a boolean value specifying whether the ResultSet cursor ...
Read MoreJava ResultSet beforeFirst() method with example
When we execute certain SQL queries (SELECT query in general) they return tabular data.The java.sql.ResultSet interface represents such tabular data returned by the SQL statements.i.e. the ResultSet object holds the tabular data returned by the methods that execute the statements which quires the database (executeQuery() method of the Statement interface in general).The ResultSet object has a cursor/pointer which points to the current row. Initially this cursor is positioned before first row.The beforeFirst() method of the ResultSet interface moves the pointer of the current (ResultSet) object to the default position (before first), from the current position.Statement stmt = con.createStatement(); ResultSet rs = ...
Read MoreJava ResultSet afterLast() method with example
When we execute certain SQL queries (SELECT query in general) they return tabular data.The java.sql.ResultSet interface represents such tabular data returned by the SQL statements.i.e. the ResultSet object holds the tabular data returned by the methods that execute the statements which quires the database (executeQuery() method of the Statement interface in general).The ResultSet object has a cursor/pointer which points to the current row. Initially this cursor is positioned before first row.The afterLast() method of the ResultSet interface moves the pointer/cursor of the current ResultSet object to next position of the last row.rs.afterLast();Let us create a table with name MyPlayers in MySQL ...
Read MoreJava ResultSet wasNull() method with example
When we execute certain SQL queries (SELECT query in general) they return tabular data.The java.sql.ResultSet interface represents such tabular data returned by the SQL statements.i.e. the ResultSet object holds the tabular data returned by the methods that execute the statements which quires the database (executeQuery() method of the Statement interface in general).The ResultSet object has a cursor/pointer which points to the current row. Initially this cursor is positioned before first row.The wasNull() method of the ResultSet interface determines whether the last column read had a Null value. i.e. whenever you read the contents of a column of the ResultSet using the ...
Read MoreJava ResultSetMetaData getColumnType() method with example
The getColumnType() method of the ResultSetMetaData (interface) retrieves the type of the specified column in the current ResultSet object.This method accepts an integer value representing the index of a column and, returns an integer value representing the SQL type of the specified column.Following is the list of values returned by various datatypes of java.sql.Type −Array: 2003Big int: -5Binary: -2Bit: -7Blob: 2004Boolean: 16Char: 1Clob: 2005Date: 91Datalink70Decimal: 3Distinct: 2001Double: 8Float: 6Integer: 4JavaObject: 2000Long var char: -16Nchar: -15NClob: 2011Varchar: 12VarBinary: -3Tiny int: -6Time stamt with time zone: 2014Timestamp: 93Time: 92Struct: 2002SqlXml: 2009Smallint: 5Rowid: -8Refcursor: 2012Ref: 2006Real: 7Nvarchar: -9Numeric: 2Null: 0Smallint: 5To get the ResultSetMetaData ...
Read MoreJava ResultSetMetaData isAutoIncrement() method with example
The is AutoIncrement() method of the ResultSetMetaData (interface) determines whether a particular column in the current ResultSet object is automatically numbered.This method accepts an integer value representing the index of a column and, returns a boolean value which is −True, if the specified column is automatically numbered.False, if the specified column is not automatically numbered.To get the ResultSetMetaData object, you need to −Register the Driver: Select the required database register the Driver class of the particular database using the registerDriver() method of the DriverManager class or, the forName() method of the class named Class.DriverManager.registerDriver(new com.mysql.jdbc.Driver());Get connection: Create a connection object by ...
Read MoreJava DatabaseMetaData supportsBatchUpdates() method with example
The supportsBatchUpdates() method of the DatabaseMetaData interface is used to determine whether the underlying database supports batch updates.This method returns a boolean value which is −True, when the underlying database supports stored porcedures.False, when the underlying database doesn't support stored porcedures.To determine whether the underlying database supports stored porcedures −Make sure your database is up and running.Register the driver using the registerDriver() method of the DriverManager class. Pass an object of the driver class corresponding to the underlying database.Get the connection object using the getConnection() method of the DriverManager class. Pass the URL the database and, user name, password of ...
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