92) What are DDL, DML, and DCL?
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- What are MySQL “Views”? ...
- How do you create and execute views in MySQL? ...
- What are MySQL Triggers? ...
- How many Triggers are possible in MySQL? ...
- What is the MySQL server? ...
- What are the MySQL clients and utilities? ...
- What are the types of relationships used in MySQL?
How to identify bad queries in MySQL?
Creating a Trace to Identify Slow Running Queries
- Selecting Events. Before you can choose which events to include in your trace, you first need to decide what information you want to capture.
- Analyzing Captured Events. ...
- Selecting Data Columns. ...
- Creating a Filter. ...
- Organizing Columns. ...
- Creating a Template. ...
- Running the Trace. ...
How difficult is MySQL?
- MySQL creates a database for storing and manipulating data, defining the relationship of each table.
- Clients can make requests by typing specific SQL statements on MySQL.
- The server application will respond with the requested information and it will appear on the clients’ side.
When should I use mysqli instead of MySQL?
- Mysqli can be used in either an object-oriented style or a procedural style. PDO is always object-oriented.
- Mysqli is only for the MySQL database. PDO supports a variety of other brands of database using the same functions.
- Mysqli supports prepared statement
How to install mysqli?
Set Up MySQL Installer for Windows
- Developer Default installs all the tools you need to develop and micromanage your MySQL databases effectively.
- Server Only is used to install an instance of the MySQL Server and forgo other MySQL products.
- Client Only installs all products except the MySQL Server and associated tools.
- The Full configuration installs all available MySQL products.
What are MySQL queries?
MySQL query is any command that used to retrieve the data from a table. MySQL can be used for querying the data, filtering data, sorting data, joining the tables, grouping data, modifying the data.
What are the basic MySQL queries?
A list of commonly used MySQL queries to create database, use database, create table, insert record, update record, delete record, select record, truncate table and drop table are given below.
What is MySQL example?
MySQL is a Relational Database Management System (RDBMS) that offers a variety of features, including: It allows us to use tables, rows, columns, and indexes and to perform database operations on them. Tables (collection of rows and columns), also known as relations, are used to construct database relationships.
What are database questions?
Most Popular Database Interview Questions And AnswersQ #1) What do you understand by 'Database'?Q #2) Define DBMS.Q #3) Define RDBMS.Q #4) Enlist the advantages of DBMS.Q #5) What do you understand by Data Redundancy?Q #6) What are the various types of relationships in Database?More items...•
How do I write in MySQL?
1:1810:27MySQL Tutorial for Beginners 5 - How to Create a Database in ... - YouTubeYouTubeStart of suggested clipEnd of suggested clipYou can see a plus sign here just click on that. Now we have to provide name for the connection thatMoreYou can see a plus sign here just click on that. Now we have to provide name for the connection that we gonna make. So just write new data you can give any connection name you want.
How do I write a query in MySQL?
Some of the commonly used MySQL queries, operators, and functions are as follows :SHOW DATABASES. This displays information of all the existing databases in the server. ... USE database_name. database_name : name of the database. ... DESCRIBE table_name. ... SHOW TABLES. ... SHOW CREATE TABLE table_name. ... SELECT NOW() ... SELECT 2 + 4; ... Comments.More items...•
What is MySQL language?
MySQL is an Oracle-backed open source relational database management system (RDBMS) based on Structured Query Language (SQL). MySQL runs on virtually all platforms, including Linux, UNIX and Windows.
Is SQL and MySQL same?
SQL is a query programming language that manages RDBMS. MySQL is a relational database management system that uses SQL. SQL is primarily used to query and operate database systems. MySQL allows you to handle, store, modify and delete data and store data in an organized way.
What are the 5 basic SQL commands?
Some of The Most Important SQL CommandsSELECT - extracts data from a database.UPDATE - updates data in a database.DELETE - deletes data from a database.INSERT INTO - inserts new data into a database.CREATE DATABASE - creates a new database.ALTER DATABASE - modifies a database.CREATE TABLE - creates a new table.More items...
Where can I practice SQL questions?
Learn SQL Online: DIY PracticeSQL Fiddle. SQL Fiddle is a great place to start if you're looking to, well, fiddle around with SQL. ... SQLZOO. You'll find it easy to get going in SQL at SQLZOO. ... Oracle LiveSQL. ... W3resource. ... Stack Overflow. ... DB-Fiddle. ... GitHub. ... Coding Ground.More items...•
What is SQL Server interview questions?
SQL Server Interview QuestionsHow to create a database in SQL Server? A database is an organized file of data. ... What is SQL? ... What is PL/SQL? ... What is the difference between SQL and PL/SQL? ... What is RDBMS? ... What is a database table? ... How do you create a table in SQL? ... How to delete a table in SQL Server?More items...•
What are the different types of queries in MySQL?
MySQL QueriesDDL (Data definition language)DML (Data manipulation language)DQL (Data query language)DCL (Data control language)TCL (Transaction control language)
How many types of functions are there in MySQL?
MySQL Numeric FunctionsFunctionDescriptionCOSReturns the cosine of a numberCOTReturns the cotangent of a numberCOUNTReturns the number of records returned by a select queryDEGREESConverts a value in radians to degrees32 more rows
What are queries in database?
A query can either be a request for data results from your database or for action on the data, or for both. A query can give you an answer to a simple question, perform calculations, combine data from different tables, add, change, or delete data from a database.
What is difference between SQL and MySQL?
SQL is a query programming language that manages RDBMS. MySQL is a relational database management system that uses SQL. SQL is primarily used to query and operate database systems. MySQL allows you to handle, store, modify and delete data and store data in an organized way.
1. What is SQL Server?
SQL Server is one of the database management systems (DBMS) and is designed by Microsoft. DBMS are computer software applications with the capabili...
2. Compare MySQL vs SQL Server.
Criteria MySQL SQL Server Developed by Oracle Microsoft Programmed in C and C++ Mainly C++, but some parts in C Platforms Supports many platforms S...
3. How and why use SQL Server?
SQL Server is free and anyone can download and use it. The application uses SQL (Structured Query Language), and it is easy to use. [blog_content_n...
4. What are the features of MySQL?
MySQL provides cross-platform support, a wide range of interfaces for application programming, and has many stored procedures like triggers and cur...
5. What are the advantages and disadvantages of using MySQL?
There are various advantages and disadvantages of using MySQL. Some of them are given below: Advantages MySQL helps in the secure management of dat...
6. What is the basic MySQL architecture?
The logical architecture of MySQL is made of ‘connection manager’, ‘query optimizer’, and ‘pluggable engines’.
7. What is the Traditional Network Library for a system?
In either Windows or POSIX systems, the named pipes provide ways of inter-process communications to connect different processes running on the same...
8. What is the default port for MySQL Server?
The default port for MySQL Server is 3306. Another standard default port is 1433 in TCP/IP for SQL Server. Learn all about SQL through this SQL Cer...
9. What do DDL, DML, and DCL stand for?
DDL is the abbreviation for Data Definition Language dealing with database schemas, as well as the description of how data resides in the database....
10. What is a join in MySQL?
In MySQL, joins are used to query data from two or more tables. The query is made using the relationship between certain columns existing in the ta...
What is the difference between MySQL and Unix?
The main difference between these values is that UNIX TIMESTAMP represents the value by using 32-bits integers and MySQL TIMESTAMP represents the value in the human-readable format.
What is a CSV table?
Answer: MySQL table that uses the CSV storage engine is called a CSV table. Data are stored as comma-separated values in the CSV table. MySQL server creates a data file with an extension ‘.csv’ to store the content of the CSV table.
What is decimal in MySQL?
Answer: A decimal data type is used in MySQL to store the fractional data. The meaning of decimal (5,2) means that the total length of the fractional value is 5. The field can contain 3 digits before the decimal point and 2 digits after the decimal point.
What is MySQL used for?
It is supported by most of the popular operating systems, such as Windows, Linux, etc. It can be used to develop different types of applications but it is mainly used for developing web applications.
What is a limit clause in SQL?
Answer: LIMIT clause is used with the SQL statement to retrieve a particular number of records from a table. From which record and how many records will be retrieved are defined by the LIMIT clause.
What is view in MySQL?
Answer: A view works as a virtual table that is used to store query and returns a result set when it is called. An updatable view is also supported by MySQL.
What is the main component of MySQL?
Answer: One of the major components of the MySQL server is the storage engine for doing different types of database operations. Each database table created is based on the specific storage engine.
What is SQL Server?
SQL Server is one of the database management systems (DBMS) and is designed by Microsoft. DBMS are computer software applications with the capability of interacting with users, various other applications, and databases. The objective of SQL Server is capturing and analyzing data and managing the definition, querying, creation, updating, and administration of the database.
Why is a timestamp used in SQL Server?
Timestamp in SQL Server helps in row versioning. Row versioning is a type of concurrency that allows retaining the value until it is committed in the database. It shows the instant time of any event. It consists of both the date and time of the event. Also, timestamp helps in backing up data during the failure of a transaction.
What is enum in a table?
The use of ENUM will limit the values that can go into a table . For instance, a user can create a table giving specific month values and other month values would not enter into the table.
What is join in MySQL?
In MySQL, joins are used to query data from two or more tables. The query is made using the relationship between certain columns existing in the table. There are four types of joins in MySQL.
What is the difference between a primary key and a candidate key?
For one table, there is only one primary key. The candidate keys can be used to reference the foreign keys. One of the candidate keys is the primary key.
What is ACID in a transaction?
ACID is the abbreviation for Atomicity, Consistency, Isolation, and Durability that are properties of any transaction.
What to do when password is lost in DB?
In such cases when the password is lost, the user should start the DB with skip-grants-table and then change the password. Thereafter, with the new password, the user should restart the DB in a normal mode.
