How to express not equal in oracle

There are two ways to express inequality in Oracle: "" operator is the most recommended inequality operator. It is used to compare whether two values ​​​​are different and return a Boolean value (TRUE or FALSE). "!=" operator has the same function as the "" operator, but is less used.

The expression of inequality in Oracle

In Oracle, the inequality operator is represented as "

Use the "" operator

"" is the recommended inequality operator in Oracle. It is used to compare two values ​​or expressions and returns a Boolean value (TRUE or FALSE) indicating whether they are not the same.

For example:

<code>SELECT * FROM table_name WHERE column_name  'value';</code>

This will return all values ​​in the "table_name" table for which the "column_name" column is not the same as "value".

Using the "!=" operator

The "!=" operator is equivalent to the "" operator, but it is less commonly used. It is used to compare two values ​​or expressions and returns a Boolean value indicating whether they are not different.

For example:

<code>SELECT * FROM table_name WHERE column_name != 'value';</code>

This will return all values ​​in the "table_name" table for which the "column_name" column is not the same as "value".

Note:

• The "" and "!=" operators are semantically the same and can be used interchangeably.
• The not-equal operator is case-sensitive.
• The NULL value is not equal to any other value, including itself.

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