Python - Function

Define Function in Python

Function is block of codes. Python provide built-in and user define both types of function.

Built-in function
User defined function

Built-in function

This type of functions are pre-defined, you can directly use in your program. For example printfunction is used for display message on screen or console.

Print hello world in python

a="Hello World!"  
print a

User defined function

This type of functions are defined by programmer. According to your requirement you can defined you function name and it's functionality. In python you can define any function by using defkeyword.

Syntax for define function in python

def function_name(parameter)
function body

Define function in python

def my_function(fname):
  print(fname + " Refsnes")

my_function("Emil")
my_function("Tobias")
my_function("Linus")

Output

Emil Refsnes

Tobias Refsnes

Linus Refsnes

Explanation

a variable store hello world string
print statement is used for display message on screen or console.

Comments

Introduction of SQL

Introduction of SQL SQL (Structure Query Language) was initially developed at IBM by Donald D. Chamberlin and Raymond F. Boyce in the early 1970s. This version, initially called SEQUEL (Structured English Query Language), was designed to manipulate and retrieve data stored in IBM's original quasi-relational database management system. Features of SQL SQL is not a case sensitive language. Every commands in SQL should ends with semicolon(;). SQL can also called as sequel (SEQUEL). SQL Sub Language SQL is mainly divided into four sub language Data Definition Language(DDL) Data Manipulation Language(DML) Transaction Control Language(TCL) Data Control Language(DCL) Only for remember You can remember all these command like below; DDL Commands "dr. cat" d-Drop, r-Rename, c-Create, a-Alter, t-Truncate. DML commands "sudi". s-Select, u-Update, d-Delete, i-Insert.

SQL Syntax

SQL Syntax SQL follows some unique set of rules and guidelines called Syntax . Some basic guidelines related to SQL Syntax are given below; SQL is not case sensitive. Commonly SQL keywords are written in uppercase. You can write SQL statements in one line or in multiple lines. SQL are depends on relational algebra and tuple are relational calculus. SQL statement SQL statements are started with any of the SQL commands/keywords like SELECT, INSERT, UPDATE, DELETE, ALTER, DROP etc. and the statement ends with a semicolon (;). Syntax SELECT * FROM table_name; Why use semicolon after SQL statements ? Semicolon is used to separate SQL statements. It is a standard way to separate SQL statements in a database system in which more than one SQL statements are used in the same call. Some Basic Commands SELECT: It is used for Retrive data from a database. UPDATE: It is used for updates data in database. DELETE: It is used for deletes data from da...

SQL Default Constraints

SQL Default Constraints Default Constraints is used to insert a default value into a column. The default value will be added to all new records, if no other value is specified. My SQL or SQL Server or Oracle or MS Access create table Employee ( e_id number(3) NOT NULL,, e_name varchar(15), sal number(5), City varchar(255) DEFAULT 'Delhi', ); In above syntax in city column by default value for city of every employee is delhi. SQL DEFAULT Constraint on Alter Table My SQL ALTER TABLE Employee ALTER City SET DEFAULT 'delhi' SQL Server or MS Access ALTER TABLE Employee ALTER COLUMN City SET DEFAULT 'delhi' Oracle ALTER TABLE Employee ALTER City SET DEFAULT 'delhi' Drop Default Constraints My SQL ALTER TABLE Employee ALTER City DROP DEFAULT SQL Server or Oracle or MS Access ALTER TABLE Employee ALTER COLUMN City DROP DEFAULT

ICT BETTER

Search This Blog