Article Categories
- All Categories
-
Data Structure
-
Networking
-
RDBMS
-
Operating System
-
Java
-
MS Excel
-
iOS
-
HTML
-
CSS
-
Android
-
Python
-
C Programming
-
C++
-
C#
-
MongoDB
-
MySQL
-
Javascript
-
PHP
Database Articles
Page 169 of 546
What kinds of programs are available in MySQL database to manage MySQL server?
MySQL database provides us the following programs as administrative tools to manage MySQL server −mysqldIt is also known as MySQL server daemon. It is the main program that does most of the work in a MySQL installation. We need to use ‘mysqld’ to start our MySQL server. It is having many options that can be specified at the time of startup.mysqladminProcessing Re-write Suggestions Done (Unique Article)Basically ‘mysqladmin’ could be a client for playacting administrative operations. we are able to use it to see the server’s configuration and current status, to create and drop databases, and plenty of a lot of.For ...
Read MoreHow can I use SUBSTRING_INDEX() function to get the substring as output which is between two same delimiters in a string?
We need to use nested SUBSTRING_INDEX() function for getting the substring as output which is between two same delimiters in a string. For example, from the string ‘www.tutorialspoint.com’, we want the substring ‘tutorialspoint’, which is in between two same delimiters ‘.’ as output then SUBSTRING_INDEX() function can be used in nested form as follows −mysql> Select SUBSTRING_INDEX(SUBSTRING_INDEX('www.tutorialspoint.com','.',2),'.',-1)AS 'Nested SUBSTRING_INDEX'; +------------------------+ | Nested SUBSTRING_INDEX | +------------------------+ | tutorialspoint | +------------------------+ 1 row in set (0.02 sec)
Read MoreHow MySQL LEFT JOIN can be used to simulate the MySQL MINUS query?
Since we cannot use MINUS query in MySQL, we will use LEFT JOIN to simulate the MINUS query. It can be understood with the help of the following example:ExampleIn this example, we are two tables namely Student_detail and Student_info having the following data −mysql> Select * from Student_detail; +-----------+---------+------------+------------+ | studentid | Name | Address | Subject | +-----------+---------+------------+------------+ | 101 | YashPal | Amritsar | History | | 105 | Gaurav | Chandigarh | Literature | | 130 | Ram | Jhansi ...
Read MoreWhen MySQL SUBSTRING_INDEX() function returns the same string, provided in the argument, as output?
MySQL SUBSTRING_INDEX() function will return the same string as output if the argument ‘count’ has the value greater than the total number of occurrences of delimiter. It can be demonstrated with the following example −mysql> Select SUBSTRING_INDEX('www.google.co.in','.',4); +-------------------------------------------+ | SUBSTRING_INDEX('www.google.co.in','.',4) | +-------------------------------------------+ | www.google.co.in | +-------------------------------------------+ 1 row in set (0.00 sec)The above query returns the same string because 4 is greater than the total number of occurrences of delimiter provided as argument i.e. ‘.’.
Read MoreHow can I start MySQL Server?
There are following two methods to start MySQL server −Using Command LineWe need to run ‘mysqld’ program to run MySQL server. It can be started using the command line with the help of the following command −C:\mysql\bin>mysqldWe will see nothing after entering the ‘mysqld’ command because it will not print any message in the command window. We should have to trust that MySQL server is running now.Using file explorer windowWe can also start MySQL server by double-clicking the file \mysql\bin\mysqld.exe on our computer.
Read MoreHow can we subtract values in MySQL table with the help of LEFT JOIN?
It can be understood with the help of an example in which two tables are having some values and we subtract the values with the help of LEFT JOIN. Here we are taking two tables having the following data −mysql> Select * from value_curdate; +----+----------+-------+ | Id | Product | Price | +----+----------+-------+ | 1 | Notebook | 100 | | 2 | Pen | 40 | | 3 | Pencil | 65 | +----+----------+-------+ 3 rows in set (0.00 sec) mysql> Select * from value_prevdate; +----+-----------+-------+ | Id | Product | ...
Read MoreHow can INTERSECTION between tables be implemented with the help of MySQL joins?
Actually, INTERSECTION is just an inner join on all columns. We are taking a simple example of two tables, having the data as follows −mysql> Select * from value1; +------+------+ | i | j | +------+------+ | 1 | 1 | | 2 | 2 | +------+------+ 2 rows in set (0.00 sec) mysql> Select * from value2; +------+------+ | i | j | +------+------+ | 1 | 1 | | 3 | 3 | +------+------+ 2 rows in set (0.00 sec)Now, the following query will do the INTERSECTION between these tables −mysql> Select * from value1 join value2 using(i,j); +------+------+ | i | j | +------+------+ | 1 | 1 | +------+------+ 1 row in set (0.08 sec)
Read MoreHow DIFFERENCES between tables can be implemented with the help of MySQL joins?
We can get the differences between the tables by unioning exclusion joins from 1st table to 2nd table and from 2nd table to 1st table. To understand it, we are taking the example of following two tables −mysql> Select * from value1; +-----+-----+ | i | j | +-----+-----+ | 1 | 1 | | 2 | 2 | +-----+-----+ 2 rows in set (0.00 sec) mysql> Select * from value2; +------+------+ | i | j | +------+------+ | 1 | 1 | | 3 | 3 ...
Read MoreHow can we distinguish between MySQL CROSS JOIN and INNER JOIN?
We can distinguish between MySQL CROSS JOIN and INNER JOIN only on the basis of join-predicate i.e. the condition specified. While writing the query for INNER JOIN we need to specify the condition but in contrast, we do not need to specify the condition while writing a query for CROSS JOIN. To understand it, we are taking the example of two tables named tbl_1 and tbl_2 which are having following data −mysql> Select * from tbl_1; +----+--------+ | Id | Name | +----+--------+ | 1 | Gaurav | | 2 | Rahul | | 3 | Raman | | 4 ...
Read MoreWhat MySQL returns if I do not use the keyword ‘RIGHT’ or ‘LEFT’ while writing the query for RIGHT JOIN or LEFT JOIN?
In both the cases i.e. on not using ‘RIGHT’ or ‘LEFT’ keyword in the query, MySQL will return the result by taking it as INNER JOIN query. It is because the only difference between RIGHT, LEFT and INNER JOIN is the keyword of RIGHT or LEFT. To understand it, we are taking the example of two tables named tbl_1 and tbl_2 which are having following data −mysql> Select * from tbl_1; +----+--------+ | Id | Name | +----+--------+ | 1 | Gaurav | | 2 | Rahul | | 3 | Raman | | 4 | Aarav | +----+--------+ ...
Read More