Check out example codes for "sql and". It will help you in understanding the concepts better.

Code Example 1

-- example
SELECT Id, ProductName, UnitPrice, Package
  FROM Product
 WHERE ProductName LIKE 'Cha_' OR ProductName LIKE 'Chan_'

Code Example 2

SELECT column1, column2, ...
FROM table_name
WHERE condition;

Code Example 3

SELECT * FROM Customers
WHERE Country='Mexico';

Code Example 4

/* AND is a operator that allows you to combine two conditions
Both conditions must be true for the row to b e included in the result set */
SELECT column_name(s)
FROM table_name
WHERE column_1 = value_1
AND column_2 = value_2;

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