In this section, we will be discussing types of SQL commands. SQL Commands are divided into five broad categories – DDL, DML, DCL, TCL, and DQL. Each category is further explained below: 1. Data Definition Language(DDL): The Data Definition Language is made up of SQL commands that can ...
DDL commands consist of different commands that have different functionalities, which I will discuss in the following order: DDL Command DESCRIPTION SYNTAX CREATE Create a table and its columns together with their datatype. CREATE TABLE ALTER
Syntax Select * from Table_Name; Example Select * from Student; SQL Copy DML(Data Manipulation Language) Command in SQL DML or Data Manipulation Language is to manipulate the data inside the database. With the help of DML commands, we can insert, delete, and change the data inside the ...
SQL, which stands forStructured Query Language, is a powerful language used for managing and manipulating relational databases. In this comprehensive guide, we will delve into SQL commands, their types, syntax, and practical examples to empower you with the knowledge to interact with databases effect...
Use of a primary key creates a clustered index that supports search improvements for comparison, in, like, and order by. Null is an allowable primary key value, but there must be only 1 row that has an all null key. Limitations: With the CREATE TABLE syntax ...
Syntax: TRUNCATE TABLE table_name; Example:Deletes all the rows from the tableEmployees. TRUNCATE TABLE EMPLOYEES; 2. DML (Data Manipulation Language) SQL commands that deals with the manipulation of data comes under DML category. The popular commands that come under DML are: ...
TheMODIFYcommands allow you to: Modify Column Data Type. Modify Column Constraints. This command requires the table name, the column name(s), and the column data-type(s). The syntax for the command is given below: Modify Column 1
For example, if we want to add a new column e.g. ISBN to the existing Books table in the LibraryDB database, the ALTER command can be used as follows: 1 2 3 USE LibraryDB ALTER TABLE Books ADD ISBN INT NOT NULL; The syntax of the ALTER command is straightforward. The ALTER stat...
Important - The syntax for DDL commands can be pretty database-specific. We are trying to make this glossary page as generic as possible, but please use the “Further Reading” section to see the specifics on how the following DDL commands would be implemented in your database of interest!
Syntax refer【anyline-simple】 any questions, please contact skype:server@anyline.org QQ群(86020680)微信群过期请联系管理员 regardless of bugs, doubts, requirements, source code, competitors Introduction The core of AnyLine is a runtime oriented metadata dynamic relationship mapping primarily used for ...