SQLite NOT

SQLite NOT operator is used in SQL statements to negate a condition or a logical expression. It is a unary operator that takes a single argument and returns the opposite of that argument’s boolean value.

The syntax of the NOT operator in SQLite is straightforward. It is written as “NOT expression”, where “expression” is any valid SQL expression that evaluates to a boolean value. For example, the following SQL statement selects all rows from a table named “customers” where the “age” column is not equal to 25:

SELECT * 
FROM customers 
WHERE NOT age = 25;

In this statement, the NOT operator negates the condition “age = 25”, which means that the query will select all rows where the “age” column is not equal to 25.

The NOT operator can also be used with other SQL operators to create more complex conditions. For example, the following SQL statement selects all rows from a table named “orders” where the “status” column is not equal to ‘delivered’ and the “total” column is greater than 1000:

SELECT * 
FROM orders 
WHERE NOT status = 'delivered' AND total > 1000;

In this statement, the NOT operator is used with the logical AND operator to create a compound condition that includes both the “status” and “total” columns.

It is important to note that the NOT operator has a higher precedence than other operators, such as AND and OR. This means that any expression that contains the NOT operator will be evaluated first, before any other operators in the expression.

In conclusion, the SQLite NOT operator is a powerful tool that can be used to negate conditions and expressions in SQL statements. It can be used to create complex conditions that involve multiple columns and operators, and it has a higher precedence than other operators in SQL expressions.