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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It would have been better if you could have provided the resource/source_code files of the CRUD operations so that we could have cross verified our code with yours.

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Course Content

  1. Introduction to PHP
    10m 23s
  2. Understanding SDLC Process
    13m 58s
  3. How to use LearnVern
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  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
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  15. Update & Delete in SQL
    12m
  16. Alter table command in SQL
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  17. MySQL Rename truncate Drop
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  18. Understanding Foreign key
    15m 37s
  19. MySQL joins
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  20. MySQL views
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  21. MySQL Function
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  22. MySQL Procedure
    15m 33s
  23. MySQL Trigger
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  24. Normalization
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  25. Assignment : MYSQL
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  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
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  2. Comparison & Logical Operators in PHP
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  3. Ternary Operator in PHP
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  4. Assignment : Operators
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  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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  2. switch case in PHP
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  3. Assignment : Conditional Statements
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  2. Call by value vs Call by reference in PHP
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  3. Assignment : Functions
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  1. Array Functions in PHP
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  2. Array in PHP
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  3. Assignment : Array
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  1. String and its Functions in PHP
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  2. Assignment : String
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  1. Loops in PHP
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  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
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  1. Include & Require Statement in PHP
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  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
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  1. SQL Injection in PHP
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  1. Crud - Registration and DB connection Part 1
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  2. Crud - Registration and DB connection Part 2
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  3. Log in Operation
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  4. Read Operation
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  5. Update Operation Part 1
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  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
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  3. MySQL Interview Question 3
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