MariaDB Interview Questions

MariaDB Interview Questions

Are you a person who has an interest in Databases and its applications? If you have a good knowledge in the database and its working, then you should definitely go with the MariaDB. This database provides the stability and availability in the market which is absolutely free. So, track down into MariaDB as a database engineer and get equipped yourself with its features and functions. To help you in cracking job, here we present you some questions which may ask in the interviews.

Here we have listed a few popular MariaDB Interview Questions.

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MariaDB Interview Questions

MariaDB function is work as a stored program in which a particular type of parameters is allowed to pass through them which in exchange, they return a value.

It is also known as inner join. You can select it by the SELECT statement. JOIN is used to recover the data from tables that should be two in number or can be more than it.

Deterministic means that the result should be one value given a number of inputs parameters.

Non-deterministic means that the result can give a different value given a number of input parameters. The result can be changed because of the data, numbers, tables etc.

MariaDB has founded by the Michael “Monty” Widenius, the founder of MYSQL. The main focus of MariaDB foundation to keep the quality of MariaDB project high.

MariaDB is developed by MySQL developers. It is a popular public source under GNU GPL which is related to database management technology. It also provides a similar trait as MySQL.IT is the modification of MySQL. Maria DB is efficient in transferring the data into the applications. The main reason for being used MariaDB is because it is scalable, speedy and easy to hand. Moreover, it provides a lot of services like the plugin, storage and much more.

The command DROP TABLE is used to delete the table in MariaDB’s database. It is needed to make sure if you really want to delete the table because it permanently deletes the table and it can’t be recovered. Triggers are also removed with the table definitions and table data so it needs to do when you are sure.

It supports almost all types of clauses in RGDBM. For example:

    • MariaDB WHERE clause: For WHERE clause there is 4 statement depending on the selection or change of location. These four statements are INSERT, DELETE, SELECT, and UPDATE.

Syntax: SELECT field1, field2 FROM table_name1, table_name2 WHERE field LIKE conditions.

    • MariaDB Order by clause: In MariaDB, Order By clause is used to set the result in ascending or descending order.

Syntax: Select expressions from table_name Order By expression.

    • MariaDB Distinct clause: This clause is used to delete duplicate records from the table if any.

Syntax: Select Distinct from expressions.

    • MariaDB From clause: The FROM clause is used to fetch the data from the tables.

Syntax: Select columns FROM table;

The company says that MariaDB is a modification of MySQL. MySQL is linked to the Oracle because the trademark is suggested by Oracle. Thus, the company decided to continue this trademark. As MySQL name has come from Monty's first daughter "My", so, for maintaining the continuity MariaDB has come from elder daughter Maria.

The main purpose of MariaDB is to supply a better, firm and community developed and also that is compatible with MySQL. It is always free DBMS on the basic level.

The main basic functions are:

    • SUM (): This function is used to summed all values in the expressions and returns the final result. In case, if there are no values in the expressions, then it returns a null value.

Syntax: Select SUM from tables where conditions.

    • MIN (): It is used to find the minimum value from all of the expressions present in the table. It can also accept the string arguments and return the minimum string values.

Syntax: Select MIN from table;

    • MAX (): It is opposite to MIN function. We can see it from the name that this is used to return the maximum value of an expression from the table. Same as MIN (), it also returns maximum string value if the argument is a string in form.

Syntax: Select MAX from table;

    • AVG (): This function is used to find the average value of the expressions in the table. This means it retrieves the average value of an expression.

Syntax: Select AVG (aggregate expression) from table;

  • TRUNCATE TABLE is used only when the whole table has to be deleted or removed permanently while the DELETE TABLE is considerably used when it has to remove only columns which can be one or more in number or has to remove the whole table.
  • Both of these TABLES (TRUNCATE and DELETE) are exactly the same. The basic difference between these two is WHERE clause.
  • Truncate table is quite faster than the delete table.
  • DELETE TABLE is used to delete row only one at a particular time and this is recorded in the transaction log.
  • TRUNCATE TABLE also kept the record in the transaction log but it firstly eliminates the data by deallocating it which is efficient to store and record. That is the main reason that TRUNCATE is faster than the DELETE TABLE.

It is done by step after step. These steps are: -

  • First of all, it needs to construct a database.
  • When it is done, select the database.
  • After that create a table by commanding CREATE TABLE statement.
  • If you want to create or delete the table you must have the privilege for it

There are 3 types of procedures in MariaDB database on the basis of references and parameter overwritten. These are

  • IN procedure- In this type of procedure, the values of a parameter can be overwritten and referenced by the procedure.
  • OUT procedure- In this type of procedure, the values of parameter can be overwritten by the procedure but it can’t be referenced by a procedure.
  • IN OUT- In this type of procedure, the values of a parameter can be referenced by the procedure but it can’t be overwritten by a procedure.

Although 5.2.5 is also efficient for windows 7 X64. But all these versions are like to prefer 5.2.6 or latest more versions.

There are some important tools of Gui/workbench for MariaDB Aria. These are

  • Webyog/SQLyog
  • HeidiSQL
  • dbForge Studio for MySQL
  • MySQL Workbench.

In spite of above all, the company is still trying to add some more support function.