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Articles by Ankith Reddy
Page 44 of 73
What is the use of comparison operators with MySQL subquery?
The subquery can return at most one value. The value can be the result of an arithmetic expression or a column function. MySQL then compares the value that results from the subquery with the value on the other side of the comparison operator. MySQL subquery can be used before or after any of the comparison operators like =, >, >=,
Read MoreMySQL BIT_LENGTH() function is multi-byte safe or not?
Just like LENGTH() function, MySQL BIT_LENGTH() function is not a multi-byte safe function. As we know that the difference of the result between multi-byte safe functions, like CHAR_LENGTH() or CHARACTER_LENGTH(), and BIT_LENGTH() function especially relevant for Unicode, in which most of the characters are encoded in two bytes or relevant for UTF-8 where the number of bytes varies. It is demonstrated in the example below −Examplemysql> Select BIT_LENGTH('tutorialspoint'); +------------------------------+ | BIT_LENGTH('tutorialspoint') | +------------------------------+ | 112 ...
Read MoreWhat would be the default return type of MySQL IFNULL() control flow operator?
Actually, the default return type of IFNULL(expression1, expression2) is more general of the two expressions, in the order STRING, REAL or INTEGER. It can be understood from the following example −Examplemysql> Create table testing Select IFNULL(100, 'testing123'); Query OK, 1 row affected (0.18 sec) Records: 1 Duplicates: 0 Warnings: 0 mysql> Select * from testing568; +-----------------------+ | IFNULL(100, 'testing') | +-----------------------+ | 100 | +-----------------------+ 1 row in set (0.00 sec) mysql> Describe testing568; +-----------------------+------------+------+-----+---------+-------+ | Field ...
Read MoreWhat is the use of MySQL IS and IS NOT operator?
In MySQL, both IS and IS NOT operators are used to test a value against a Boolean value.The syntax of IS operator can be as follows −Val IS Boolean_valHere Val is the value that we want to test against Boolean value.Boolean_val is the Boolean value against which the value would be tested and it can be TRUE, FALSE or UNKNOWN.The syntax of IS NOT operator can be as follows −Val IS NOT Boolean_valHere Val is the value that we want to test against Boolean value.Boolean_val is the Boolean value against which the val would be tested and it can be TRUE, FALSE or UNKNOWN.Following MySQL statements will demonstrate ...
Read MoreHow can we produce a string, other than default binary string, in a given character set by MySQL CHAR() function?
We can use the keyword USING to produce a string, other than default binary string, in a given character set. Following result set will demonstrate it −mysql> Select CHARSET(CHAR(85 USING utf8)); +------------------------------+ | CHARSET(CHAR(85 USING utf8)) | +------------------------------+ | utf8 | +------------------------------+ 1 row in set (0.00 sec)The above result set shows that the returned binary string is utf8 because we write utf8 after the keyword USING.mysql> Select CHARSET(CHAR(85 USING latin1)); +--------------------------------+ | CHARSET(CHAR(85 USING latin1)) | +--------------------------------+ | latin1 ...
Read MoreHow can we find the most recent and most oldest date from a table with the help of MySQL MAX() and MIN() functions?
For getting the most recent date from a table, we need to provide the name of the column, having a date as value, as the argument of MAX() function. Similarly, forgetting the oldest date from a table, we need to provide the name of a column, having a date as value, as the argument of MIN() function. To understand it, consider the following example of table ‘Collegedetail’, having the following details −mysql> Select * from collegedetail; +------+---------+------------+ | ID | Country | estb | +------+---------+------------+ | 111 | INDIA ...
Read MoreHow to use MySQL Date functions with WHERE clause?
By using the WHERE clause with any of the MySQL date functions, the query will filter the rows based on the condition provided in the WHERE clause. To understand it, consider the data from ‘Collegedetail’ table as followsmysql> Select * from Collegedetail; +------+---------+------------+ | ID | Country | Estb | +------+---------+------------+ | 111 | INDIA | 2010-05-01 | | 130 | INDIA | 1995-10-25 | | 139 | USA | 1994-09-25 | | 1539 | UK ...
Read MoreHow does MySQL IF() function work?
MySQL IF() function is one of the MySQL control flow functions that returns a value based on a condition. It is sometimes referred to as IF ELSE or IF THEN ELSE function. Basically, it takes three expressions and if the first expression is true (not ZERO and not NULL), it returns the second expression. Otherwise, it returns the third expression. Its syntax is as follows −SyntaxIF(expr, value_if_true, value_if_false)Here expr is the expression having some condition.Value_if_true is the value to return if expr evaluates to TRUE.Value_if_false is the value to return if expr evaluates to FALSE.Examplemysql> Select IF(100=100, 'YES', 'NO'); +------------------------+ ...
Read MoreWhat is the importance of the order of Columns in the SET clause of UPDATE statement? Will it make big difference in result set returned by MySQL?
The order of columns in the SET clause of UPDATE statement is important because MySQL provides us the updated value on columns names used in an expression. Yes, it will make big difference in the result set returned by MySQL. Following is an example to make it clear −ExampleIn this example, we are having a table ‘tender’. First, we will write UPDATE statement by using ‘tender_id’ as the first and ‘rate’ as the second column in SET clause and then we will write UPDATE statement by using ‘rate’ as the first and ‘tender_id’ as the second column on table ‘tender’.mysql> ...
Read MoreHow is it possible to filter out the duplications in the rows of result set return by MySQL?
It can be possible by using the DISTINCT keyword in SELECT clause. The DISTINCT applies to the combination of all data fields specified in SELECT clause.ExampleWe have the table ‘Student’ on which we have applied DISTINCT keyword as follows −mysql> Select * from student; +------+---------+---------+-----------+ | Id | Name | Address | Subject | +------+---------+---------+-----------+ | 1 | Gaurav | Delhi | Computers | | 2 | Aarav | Mumbai | History | | 15 | ...
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