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MySQLi Articles
Page 79 of 341
How can we use ORDER BY clause while calculating the Date?
It would be more convenient to find a record if we will use ORDER BY clause while calculating the date. To understand it, we have the data from table ‘Collegedetail’ as follows −mysql> Select * from Collegedetail; +------+---------+------------+ | ID | Country | Estb | +------+---------+------------+ | 111 | INDIA | 2010-05-01 | | 130 | INDIA | 1995-10-25 | | 139 | USA | 1994-09-25 | | 1539 | UK | 2001-07-23 | | 1545 ...
Read MoreDo we require any authentication for login into MySQL command line tool?
Yes, we require authentication for login into MySQL command line tool. For example, if we are trying to log in from windows command line then it will prompt for the password every time. The command for login is as follows −C:\Program Files\MySQL\bin>mysql -u root -p Enter password: *****
Read MoreHow can we find out the storage engine used for a particular table in MySQL?
The following MySQL statement can find out the storage engine used for ‘Student’ table in database named ‘tutorial’ −mysql> SELECT ENGINE FROM information_schema.TABLES -> WHERE TABLE_SCHEMA = 'tutorial' -> AND TABLE_NAME = 'Student'; +--------+ | ENGINE | +--------+ | MyISAM | +--------+ 1 row in set (0.13 sec)
Read MoreWhile creating a MySQL table, how can I specify the storage engine of my choice rather than using the default storage engine InnoDB?
While creating a MySQL table, the storage engine can be specified as follows −mysql> CREATE TABLE Student(id INTEGER PRIMARY KEY, Name VARCHAR(15)) -> ENGINE = 'MyISAM'; Query OK, 0 rows affected (0.28 sec)The ENGINE keyword specifies the storage engine used for this particular table.
Read MoreHow MySQL evaluates if I try to add two numbers that are contained in quotes?
If we are trying to add two numbers that are contained in quotes, means we are treating the string as a number. In this case, MySQL converts the value into the closet numeric equivalent and evaluates the result. Following example will demonstrate it.Examplemysql> Select '1525' + '200'As Total; +-------+ | Total | +-------+ | 1725 | +-------+ 1 row in set (0.00 sec)
Read MoreHow can column data be used within MySQL CASE statement?
To understand it consider the data, as follows, from the table ‘Students’ −mysql> Select * from Students; +----+-----------+-----------+----------+----------------+ | id | Name | Country | Language | Course | +----+-----------+-----------+----------+----------------+ | 1 | Francis | UK | English | Literature | | 2 | Rick | USA | English | History ...
Read MoreHow can we establish MySQL database by using MySQL binary at commandnprompt?
You can establish the MySQL database using the mysql binary at the command prompt. It can be understood with the help of the following example −ExampleWe can use following statements to connect to the MySQL server from the command prompt −[root@host]# mysql -u root -p Enter password:******This will give us the mysql> command prompt where we will be able to execute any SQL command. Following is the result of above command −The following code block shows the result of above code −Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 4 Server version: 5.7.20 MySQL ...
Read MoreHow can we distinguish between MySQL IFNULL() and NULLIF() functions?
Actually, both MySQL IFNULL() and NULLIF() functions are having an almost same syntax as given below −The syntax of IFNULL()IFNULL(expression1, expression2)The syntax of NULLIF()NULLIF(expression1, expression2)They can be distinguished in the way they return the first argument as result. IFNULL() function will return the first argument as a result if it is not NULL and NULLIF() function will return the first argument as a result if both the arguments are not same.mysql> Select IFNULL('Ram', 'Shyam'); +-----------------------+ | IFNULL('Ram', 'Shyam') | +-----------------------+ | Ram | +-----------------------+ 1 row in set (0.00 sec) mysql> Select ...
Read MoreIn MySQL, without having BOOLEAN data type how can we show TRUE and FALSE values?
As we know that there is no BOOLEAN data type in MySQL hence by using TRUE or true, FALSE or false we can enter Boolean values in MySQL statement.Examplemysql> Select TRUE,FALSE; +------+-------+ | TRUE | FALSE | +------+-------+ | 1 | 0 | +------+-------+ 1 row in set (0.00 sec) mysql> Select true,false; +------+-------+ | TRUE | FALSE | +------+-------+ | 1 | 0 | +------+-------+ 1 row in set (0.00 sec)
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'); +------------------------+ ...
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