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In SQL, there are two uses of the IN keyword, and this section introduces the one that is related to the WHERE clause. When used in this context, we know exactly the value of the returned values we want to see for at least one of the columns. The syntax for using the IN keyword is as follows:
WHERE "column_name" IN ('value1', 'value2', ...);
The number of values in the parenthesis can be one or more, with each values separated by comma. Values can be numerical or characters. If there is only one value inside the parenthesis, this commend is equivalent to,
WHERE "column_name" = 'value1'
For example, we may wish to select all records for the Los Angeles and the San Diego stores in Table Store_Information,
we key in,
WHERE Store_Name IN ('Los Angeles', 'San Diego');
For these exercises, assume we have a table called Users with the following data:
1. Which of the following SQL statement is valid? (There can be more than one answer)
2. How many records will be returned by the following query?
3. How many records will be returned by the following query?