It can be used to compare two values. If you use double equal sign(==) in MySQL, you will get an error message. Now, compare the above variable value with 10. If both the values are same then the result will be 1 otherwise 0.
What does == do in SQL?
It can be used to compare two values. If you use double equal sign(==) in MySQL, you will get an error message. Now, compare the above variable value with 10. If both the values are same then the result will be 1 otherwise 0.
How do I check if two values are equal in SQL?
SQL Equal to ( = ) operator The equal to operator is used for equality test within two numbers or expressions.
Why == is not used in SQL?
As a result, SQL doesn’t have the problem of ambiguity of = meaning either assignment or equality check. As a result, there is no problem with using = to check equality. On the other hand, in a programming language such as Java, single = is used for assignments, while == is used for comparison.
What is @@ in SQL?
These are explained as following below. @@SERVERNAME : This is used to find the name of the machine/computer on which SQL Server is running. Example – Select @@servername.
What is the === comparison operator used for?
Equal to ( === ) — returns true if the value on the left is equal to the value on the right, otherwise it returns false .
What does the === comparison operator do?
The strict equality ( === ) operator checks whether its two operands are equal, returning a Boolean result. Unlike the equality operator, the strict equality operator always considers operands of different types to be different.
What is the difference between == and === comparison?
The == operator checks if two values are equal. The != operator checks if two values are not equal. It is also known as the loose equality operator because it checks abstract equality, i.e., it tends to convert the data types of operands in order to carry the comparison when two operands aren’t of the same data type.
How do you delete duplicates in SQL?
SQL Delete Duplicate Rows using Group By and Having Clause According to Delete Duplicate Rows in SQL, for finding duplicate rows, you need to use the SQL GROUP BY clause. The COUNT function can be used to verify the occurrence of a row using the Group by clause, which groups data according to the given columns.
Can I compare two strings in SQL?
In SQL Server, there are many built-in string functions that can be used by developers. We can compare strings by using the IF-ELSE statement.
How does the == operator check for equality?
The equal-to operator ( == ) returns true if both operands have the same value; otherwise, it returns false . The not-equal-to operator ( != ) returns true if the operands don’t have the same value; otherwise, it returns false .
Can we compare 2 NULL values in SQL?
Comparing NULL values Since you can’t use a equality operator in the WHERE clause (remember, NULL values can’t be equated or compared), the right way to compare NULL values is to use the IS and IS NOT operators.
Can you loop in SQL?
In SQL Server, a loop is the technique where a set of SQL statements are executed repeatedly until a condition is met. SQL Server supports the WHILE loop. The execution of the statements can be controlled from within the WHLE block using BREAK and CONTINUE keywords.
What is the difference between & and && in SQL?
NOTE: There is only one difference between AND and && is that AND is a standard while && is ownership syntax.
What are the four 4 operations used in SQL?
There are six types of SQL operators that we are going to cover: Arithmetic, Bitwise, Comparison, Compound, Logical and String.
How do I check if two values are equal in SQL?
SQL Equal to ( = ) operator The equal to operator is used for equality test within two numbers or expressions.
WHY NOT NULL is used in SQL?
The NOT NULL constraint enforces a column to NOT accept NULL values. This enforces a field to always contain a value, which means that you cannot insert a new record, or update a record without adding a value to this field.
Is NULL or is not null?
The IS NULL condition is satisfied if the column contains a null value or if the expression cannot be evaluated because it contains one or more null values. If you use the IS NOT NULL operator, the condition is satisfied when the operand is column value that is not null, or an expression that does not evaluate to null.
IS NULL operator in SQL?
The IS NULL operator is used to test for empty values (NULL values).
What are the 4 parts of SQL?
The scope of SQL includes data query, data manipulation (insert, update, and delete), data definition (schema creation and modification), and data access control.
What is difference between and @@ in SQL?
There is no difference. The rules for variables state that they start with an ‘@’ character and follow the rules for identifiers.
Is == A comparison operator?
If either of the operands is a string value, then a string comparison is used. Enclose strings in quotes (“string”). Caution! The == operator is a comparison operator.
