How do you create and execute views in MySQL?Ĭreating a view is accomplished with the CREATE VIEW statement. Views make it easy to retrieve the way of making the query available via an alias.Ģ. In MySQL, a view consists of a set of rows that is returned if a particular query is executed. Intermediate MySQL Interview Questions 1. For example: CREATE USER ‘testuser’ IDENTIFIED BY ‘sample password’ You can add a User by using the CREATE command and specifying the necessary credentials. You could store your complete novel as a file in a BLOB if needed. For example - documents, images, and even videos. It is used to hold a variable amount of data.Ī BLOB can hold a very large amount of data. What is BLOB in MySQL?īLOB is an acronym that stands for a binary large object. What are the Temporal Data Types in MySQL? Type Nameĭate and time value, in ' CCYY-MM-DD hh : mm :ss ' formatĪ timestamp value, in ' CCYY-MM-DD hh : mm :ss ' formatĮxample: To select the records with an Order Date of '' from a table: SELECT * FROM Orders WHERE OrderDate='' 19. This value is different than a zero value or a field that contains spaces.ġ8. A NULL value in a table is a value in a field that appears to be blank. NULL in SQL is the term used to represent a missing value. What are the String Data Types in MySQL? Type NameĪn enumeration each column value is assigned, one enumeration memberĪ set each column value is assigned zero or more set members

A special attribute enables the automatic generation of sequential integer or floating-point column values, which is useful for applications that require a series of unique identification numbers. Numeric types can be signed or unsigned, except BIT. MySQL has numeric data types for integer, fixed-point, floating-point, and bit values, as shown in the table below. What are the Numeric Data Types in MySQL? One can view all the databases on the MySQL server host using the following command: In MySQL, the DELETE statement is used to delete records from a table: DELETE FROM table_name Indexes speed up performance by either ordering the data on disk so it's quicker to find your result or, telling the SQL engine where to go to find your data.Įxample: Adding indexes to the history table: ALTER TABLE history ADD INDEX(author(10)) ĪLTER TABLE history ADD INDEX(title(10)) ĪLTER TABLE history ADD INDEX(category(5)) ĭESCRIBE history 14. You can achieve fast searches with the help of an index. In MySQL, there are different index types, such as a regular INDEX, a PRIMARY KEY, or a FULLTEXT index. You can remove a column by using the DROP keyword:ĪLTER TABLE classics DROP pages 13. How do you remove a column from a database? The INSERT INTO syntax would be as follows: INSERT INTO table_name However, the order of the values should be in the same order as the columns in the table. If we want to add values for all the columns of the table, we do not need to specify the column names in the SQL query. The INSERT INTO statement is used to add new records to a MySQL table: INSERT INTO table_name (column1, column2, column3.) Use the following to create a table using MySQL: CREATE TABLE history ( Use the following command to create a new database called ‘books’:ĬREATE DATABASE books 10. What are some of the common MySQL commands? Commandĩ. One can query a database for specific information and have a record returned. There are three main ways you can interact with MySQL:Ī query is a specific request or a question. Within these rows are various columns or fields that contain the data itself. What does a MySQL database contain?Ī MySQL database contains one or more tables, each of which contains records or rows. You can check out this SQL Tutorial to learn more about SQL. However, it is a good practice to write the SQL keywords in CAPS and other names and variables in a small case. Rowling’ Note that SQL is not case sensitive. SELECT title FROM publications WHERE author = ' J. One can use commands such as the following to send requests from a database: This language is also used in other databases such as Oracle and Microsoft SQL Server. The SQL in MySQL stands for Structured Query Language. What are Transaction Storage Engines in MySQL? Can you explain the logical architecture of MySQL? What are the types of relationships used in MySQL? What are the MySQL clients and utilities? How do you create and execute views in MySQL? What are the Temporal Data Types in MySQL? What are some of the common MySQL commands? What are some of the advantages of using MySQL?

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