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What are the two major components of SQL and what function do they serve?
Wiki User
∙ 12y ago
The Data Definition Language (DDL). This component of the SQL language is used to create and modify tables and other objects in the database. For tables there are three main commands:
CREATE TABLE tablename to create a table in the database
DROP TABLE tablename to remove a table from the database
ALTER TABLE tablename to add or remove columns from a table in the database.
The Data Manipulation Language (DML) component of the SQL language is used to manipulate data within a table. There are four main commands:
then,
SELECT to select rows of data from a table
INSERT to insert rows of data into a table
UPDATE to change rows of data in a table
DELETE to remove rows of data from a table
Wiki User
∙ 12y ago
The two major components of SQL are Data Definition Language (DDL) and Data Manipulation Language (DML). DDL is responsible for defining and modifying the structure of the database, including creating and altering tables. DML is used to manipulate and retrieve data within the database, with commands such as SELECT, INSERT, UPDATE, and DELETE.
Saad Latif
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Marlon Klocko
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DDL And DML
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Why do you need to study SQL?
Studying SQL allows you to effectively manage and manipulate data in relational databases, which is crucial for many modern applications and businesses. It helps you retrieve specific information, analyze data, and make informed decisions based on data patterns. Learning SQL enhances your job prospects in fields like data analysis, data science, and software development.
What is the difference between sql and an sql server?
SQL stands for Structured Query Language and is a programming language used to manage and manipulate relational databases. An SQL server, on the other hand, is software specifically designed to store, retrieve, and manage data based on SQL queries. SQL is the language used to interact with an SQL server.
What are the differences between Pervasive SQL and MS SQL?
Pervasive SQL is a relational database management system designed for embedded applications, while MS SQL, or Microsoft SQL Server, is a full-fledged RDBMS with advanced features for enterprise applications. MS SQL provides more robust scalability, security, and integration options compared to Pervasive SQL. Additionally, MS SQL is commonly used in larger organizations, while Pervasive SQL is often utilized in smaller businesses and embedded systems.
What is Resource-Intensive SQL?
Resource-intensive SQL refers to SQL queries that consume a significant amount of system resources such as CPU, memory, or disk storage. These queries can slow down performance and impact the overall efficiency of the system. It is important to optimize resource-intensive SQL queries to improve system performance.
Where can one find out how to do sql date format?
You can find information on SQL date formats in the documentation of the specific database management system you are using, such as MySQL, SQL Server, or PostgreSQL. These documents typically include details on how to format dates in SQL queries and functions. Additionally, online tutorials and forums can provide examples and guidance on SQL date formatting.
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