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Questions and Answers
Which part of SQL includes commands to create databases and objects like tables, indexes, and views?
Which part of SQL includes commands to create databases and objects like tables, indexes, and views?
What are the main data types used in SQL?
What are the main data types used in SQL?
Which command is used to create a database in MySQL?
Which command is used to create a database in MySQL?
What is a common string data type in SQL?
What is a common string data type in SQL?
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Which language is used to define access rights for databases in SQL?
Which language is used to define access rights for databases in SQL?
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Which type of keys can be defined in SQL to establish relationships between tables?
Which type of keys can be defined in SQL to establish relationships between tables?
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What character is used as a delimiter for queries in the CLI of SQL?
What character is used as a delimiter for queries in the CLI of SQL?
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Which interface is encouraged for creating tables in SQL based on the text?
Which interface is encouraged for creating tables in SQL based on the text?
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Which entities have many relationships based on the text?
Which entities have many relationships based on the text?
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What does the Sales statement table lack according to the text?
What does the Sales statement table lack according to the text?
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Study Notes
- SQL is a standard programming language used for creating databases, it is cross-platform and has the same syntax across different SQL servers.
- SQL is divided into three parts: Data Definition Language (DDL), Data Manipulation Language (DML), and Data Control Language (DCL).
- DDL includes commands to create database and objects such as tables, indexes, and views, and to define access rights to those databases.
- Commands to create a database include "create database", "create table" with qualifiers and constraints, "create index", "create view", and various drop commands.
- SQL uses three main data types: string, numeric, and date and time.
- Common string data types include VARCHAR, while common numeric data types include INTEGER, DOUBLE, and FLOAT.
- Creating a database involves using the command line interface (CLI) in MySQL and creating tables with their attributes.
- Creating a database in MySQL involves using the "create database" command, after which tables can be created using the "create table" command with their attributes defined.
- Foreign keys can be defined to establish relationships between tables.
- The CLI uses a semicolon as a delimiter for queries.
- Tables can be created in the MySQL admin interface but are encouraged to be created using the CLI for this course.- Product code and stable are associated entities with many relationships.
- Sales statement table does not have its own primary key.
- Creating an associative entity (sales statement) for easier implementation between product and stable tables.
- Data definition language (DDL) is used to create the foundation of a database.
- First, create a database, then create tables under it.
- Create tables without primary keys first, as they can be used as foreign keys in other tables.
- Sales statement table lacks a primary key, instead it has foreign keys (report code and product code).
- When defining a foreign key, it should be a primary key from a source table.
- Carefully create tables in the correct order to ensure proper foreign key definitions.
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Description
Test your knowledge on creating databases and defining database schema using Data Definition Language (DDL) commands in SQL. This quiz covers topics such as creating databases, tables, indexes, views, data types, and establishing relationships between tables using foreign keys.
