What is difference between and and/or in SQL?
The only difference between AND and OR is their behaviour. When we use AND to combine two or more than two conditions, records satisfying all the specified conditions will be there in the result.
What is the difference between and operator and/or operator?
The bitwise OR operator sets the bit value whereas the logical OR operator sets true or 1 if either one of the conditions/bit value is 1 else it sets false or 0.
What is or operator in MySQL?
MySQL OR operator compares two expressions and returns TRUE if either of the expressions is TRUE. When more than one logical operator is used in a statement, OR operators perform after AND operator. The order of evaluation can be changed by using parentheses.
WHAT IS LIKE operator in SQL?
The SQL Like is a logical operator that is used to determine whether a specific character string matches a specified pattern. It is commonly used in a Where clause to search for a specified pattern in a column. This operator can be useful in cases when we need to perform pattern matching instead of equal or not equal.
What is the use of or operator?
The logical OR operator ( || ) returns the boolean value true if either or both operands is true and returns false otherwise. The operands are implicitly converted to type bool before evaluation, and the result is of type bool . Logical OR has left-to-right associativity.
What is use of with in SQL?
The SQL WITH clause allows you to give a sub-query block a name (a process also called sub-query refactoring), which can be referenced in several places within the main SQL query. … The SQL WITH clause was introduced by Oracle in the Oracle 9i release 2 database.
What does PK mean in database?
Primary key (PK) – value which uniquely identifies every row in the table. Foreign keys (FK) – values match a primary or alternate key inherited from some other table. Alternate Keys (AK) – key associated with one or more columns whose values uniquely identify every row in the table, but which is not the primary key.
Which is constraint in SQL?
SQL constraints are a set of rules implemented on tables in relational databases to dictate what data can be inserted, updated or deleted in its tables. This is done to ensure the accuracy and the reliability of information stored in the table.
Why use .equals instead of == Java?
We can use == operators for reference comparison (address comparison) and . equals() method for content comparison. In simple words, == checks if both objects point to the same memory location whereas . equals() evaluates to the comparison of values in the objects.
What is the use of == === operators in SQL?
An operator is a reserved word or a character used primarily in an SQL statement’s WHERE clause to perform operation(s), such as comparisons and arithmetic operations. These Operators are used to specify conditions in an SQL statement and to serve as conjunctions for multiple conditions in a statement.