FROM nhanvien
WHERE ho I
N ('Smith', 'Anderson', 'Johnson'); The result will be rows from the table if the employee's surname is Smith, Anderson or Johnson. Due to using * in the SELECT statement, all fields in the table of contents will be in the result set.
The above example is similar to the SELECT command below.
SELECT *
FROM nhanvien
WHERE ho = 'Smith'
OR ho = 'Anderson'
OR ho = 'Joh
nson';
Using the IN condition helps the command look shorter and easier to understand.
For example - with numerical values
SELECT *
FROM nhanvien
WHERE nha
nvien_id IN (1, 2, 3, 4, 10);
The returned result is the employee whose ID is 1, 2, 3, 4 or 10. The above command is equivalent to the following command.
SELECT*
FROM nhanvien
WHERE nhanvien_id = 1
OR nhanvien_id = 2
OR nhanvien_id = 3
OR nhanvien_id = 4
OR nhanvien_i
d = 10;
For example - use the NOT operator
SELECT *
FROM nhanvien
WHERE t
en NOT IN ('Sarah', 'John', 'Dale');
In the above example, the result set consists of rows from the table that have the employee name other than Sarah, John or Dale. Sometimes it is easier to find values that are not values you want. The above example is equivalent to the command below.
SELECT *
FROM nhanvien
WHERE ten <> 'Sarah'
AND ten <> 'John'
AND ten <> 'Dale';
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