PHP Course For Beginners > MY SQL with PHP

Null & Not Null Condition

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Overview
Null and Not Null Condition in SQL In the same way that every other programming language has a conditional operator that returns True or False, there is a conditionals operator in SQL that returns Null or Not Null.
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In SQL, the IS NOT NULL condition is used to check for non-NULL values. If a non-NULL value is detected, it returns TRUE; otherwise, it returns FALSE. In a SELECT, INSERT, UPDATE, or DELETE statement, it can be utilised.

The is null() method is used to determine whether a variable is null or not. If a variable has no value stored in it, it is deemed NULL. If the value of variable $var is NULL, it returns TRUE; otherwise, it returns FALSE.

The isset() function determines whether a variable is set, that is, whether it has been declared and is not NULL. If the variable exists and is not NULL, this method returns true; otherwise, it returns false.

In a SELECT statement, here's an example of how to use the MySQL IS NOT NULL condition: SELECT * FROM contacts WHERE last name IS NOT NULL; This MySQL IS NOT NULL example returns all records from the contacts table that do not have a null value for last name.

The is null() method determines whether or not a variable is NULL. If the variable is NULL, this method returns true (1); otherwise, it returns false/nothing.

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Course Content

  1. Introduction to PHP
    10m 23s
  2. Understanding SDLC Process
    13m 58s
  3. How to use LearnVern
    3m 20s
  4. Client Server Architecture
    5m 18s
  5. How to set up PHP Environment?
    18m 6s

  1. What is Data
    8m 57s
  2. What is Database
    3m 25s
  3. What is DBMS
    14m 25s
  4. SQL Queries and its types
    16m 57s
  5. Data Types in SQL - from 16
    22m 41s
  6. SQL constraints
    10m 52s
  7. Create, Drop & Show Database
    13m 40s
  8. SQL Create Table
    13m 53s
  9. SQL Insert & Select Statement
    26m 56s
  10. Operators in SQL
    6m 47s
  11. In & NOt in Condition
    7m 4s
  12. Null & Not Null Condition
    4m 55s
  13. Clauses in SQL
    9m 46s
  14. Understanding Having, Distinct & Group by
    21m 54s
  15. Update & Delete in SQL
    12m
  16. Alter table command in SQL
    15m 29s
  17. MySQL Rename truncate Drop
    6m 34s
  18. Understanding Foreign key
    15m 37s
  19. MySQL joins
    22m 56s
  20. MySQL views
    18m 23s
  21. MySQL Function
    21m 39s
  22. MySQL Procedure
    15m 33s
  23. MySQL Trigger
    16m 15s
  24. Normalization
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  25. Assignment : MYSQL
    8m 56s

  1. Understanding HTTP Methods
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  1. Understanding PHP Program structure Comments in PHP
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  1. Variables in PHP
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  1. Arithmetic & Assignment Operators in PHP
    24m 28s
  2. Comparison & Logical Operators in PHP
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  3. Ternary Operator in PHP
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  4. Assignment : Operators
    1m 22s

  1. Super Global Variable in PHP
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  2. GET & POST Variable in PHP
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  3. $_FILES & $_ENV in PHP
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  4. Assignment : Super Global Variables
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  1. If-else in PHP
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  2. switch case in PHP
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  3. Assignment : Conditional Statements
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  1. Functions in PHP
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  2. Call by value vs Call by reference in PHP
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  3. Assignment : Functions
    5m 25s

  1. Array Functions in PHP
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  2. Array in PHP
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  3. Assignment : Array
    7m 18s

  1. String and its Functions in PHP
    27m 53s
  2. Assignment : String
    3m 44s

  1. Loops in PHP
    19m 28s
  2. More examples on Loops in PHP
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  3. Assignment : Loops
    8m 32s

  1. Cookies in PHP
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  2. Session in PHP
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  1. Header Function in PHP
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  2. Assignment : Header Functions
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  1. Date and Time functions in PHP
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  2. Assignment : Date Time Functions
    4m 29s

  1. Include & Require Statement in PHP
    13m 52s

  1. Error Handling in PHP
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  1. File Upload in PHP
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  1. Database Connection in PHP Part 1
    29m 17s
  2. Database Connection in PHP Part 2
    32m

  1. SQL Injection in PHP
    30m 33s

  1. Crud - Registration and DB connection Part 1
    31m 31s
  2. Crud - Registration and DB connection Part 2
    24m 2s
  3. Log in Operation
    27m 24s
  4. Read Operation
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  5. Update Operation Part 1
    12m 53s
  6. Update Operation Part 2
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  7. Log out Operation
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  1. MySQL Interview Question 1
    33m 7s
  2. MySQL Interview Question 2
    25m 23s
  3. MySQL Interview Question 3
    24m 27s
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