SQL WHERE Keyword
WHERE command filters a result set to include only records that fulfill a specified condition.
The following SQL statement selects all the customers from "Mexico" in the "Customers" table:
SQL requires single quotes around text values (most database systems will also allow double quotes).
However, numeric fields should not be enclosed in quotes:
Note: The WHERE clause is not only used in SELECT statement, it is also used in UPDATE, DELETE statement, etc.!
The following operators can be used in the WHERE clause:
|<>||Not equal. Note: In some versions of SQL this operator may be written as !=|
|>=||Greater than or equal|
|<=||Less than or equal|
|BETWEEN||Between a certain range|
|LIKE||Search for a pattern|
|IN||To specify multiple possible values for a column|