Mysql Interview Questions and Answers. MySQL questions are very usefull for freshers to learn easly. Learn Database Management System, purpose of. results Go through on MySQL jobs interview questions and answers page to excel your skills for an interview. Just log into our portal to find the right. Today we're having a huge collection of MySQL interview questions to help both the freshers and experienced people searching for job.
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MySQL is an open source DBMS which is built, supported and distributed Top 50 MySQL Interview Questions & Answers .. Download PDF. MySQL is open source software which is available at any time and has no cost involved. MySQL is portable. GUI with command prompt. Administration is. Here is some most commonly asked interview qyestions collections about MySQL. Download Complete PHP Faqs in echecs16.info you are a PHP programmer or an.
June 17, Last Updated: January 7, We have reached here all because of yours support and we seek the same in future form your end. Here in this article we will be concentrating on the practical aspect of MySQL, the question relevant for Interview aspect. So, select database as shown in the following command. Well both has its advantages and disadvantages. With large tables we may need to implement it manually but for small tables, applications like phpMyAdmin can do the job.
Main differences: The heap tables are shared among clients while temporary tables are not shared.
Heap tables are just another storage engine, while for temporary tables you need a special privilege create temporary table. FLOAT stores floating point numbers with accuracy up to 8 places and allocates 4 bytes, on the other hand DOUBLE stores floating point numbers with accuracy up to 18 places and allocates 8 bytes.
MySQL is great for database enabled websites while Oracle is made for enterprises. MySQL is portable.
MySQL is not so efficient for large scale databases. Transactions are not handled very efficiently. Functionality of MySQL is highly dependent of other addons. Development is not community driven.
The maximum no. Every time you need to open and close database connection, depending on the request. Opens page whenever it is loaded.
The database connection cannot be closed. It is more useful if your site has more traffic because there is no need to open and close connection frequently and every time when page is loaded.
Hence it can save the programmer from deleting the entire table my mistake if he does not use WHERE clause.
Install antivirus and configure the operating system's firewall.
Change root username and password Restrict or disable remote access. Mysqladmin -u root -p password "newpassword".
Let us take a table named the employee. To find Nth highest salary is: select distinct salary from employee order by salary desc limit n-1,1 if you want to find 3rd largest salary: select distinct salary from employee order by salary desc limit 2,1 26 What is MySQL default port number?
MySQL default port number is A Regular expression is a powerful way of specifying a pattern for a sophisticated search. Basically it is a special text string for describing a search pattern.
To understand it better you can think of a situation of daily life when you search for. The regex equivalent for. You can create maximum of 16 indexed columns for a standard table. A defined point in any transaction is known as savepoint. It is the most popular MySQL manager and admin tool. It is easy to back up data with phpMyAdmin. Select the database you want to backup by clicking the database name in the left-hand navigation bar.
Then click the export button and make sure that all tables are highlighted that you want to back up. Using EXEC. What are the various levels of constraints?
Constraints are the representation of a column to enforce data entity and consistency. How can you fetch common records from two tables? For example: 1 Select studentID from student. List some case manipulation functions in SQL? It takes a string as an argument and returns it by converting it into lower case. It takes a string as an argument and returns it by converting it into uppercase.
Some of the available set operators are — Union, Intersect or Minus operators. ALIAS name can be given to any table or a column.
For example- Select emp. Result from employee emp, department as dept where emp. What are aggregate and scalar functions? Aggregate functions are used to evaluate mathematical calculation and returns a single value.
These calculations are done from the columns in a table. For example- max ,count are calculated with respect to numeric.
Scalar functions return a single value based on the input value. How can you fetch alternate records from a table?
You can fetch alternate records i. Name the operator which is used in the query for pattern matching? LIKE operator is used for pattern matching, and it can be used as -. How can you select unique records from a table?