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The SELECT DISTINCT statement is used to return only distinct (different) values.
he WHERE clause is used to filter records.
The WHERE clause is used to extract only those records that fulfill a specified condition.
The WHERE clause can be combined with AND, OR, and NOT operators.
The AND and OR operators are used to filter records based on more than one condition:
The AND operator displays a record if all the conditions separated by AND are TRUE.
The OR operator displays a record if any of the conditions separated by OR is TRUE.
The NOT operator displays a record if the condition(s) is NOT TRUE.
the ORDER BY keyword is used to sort the result-set in ascending or descending order.
The ORDER BY keyword sorts the records in ascending order by default. To sort the records in descending order, use the DESC keyword.
the INSERT INTO statement is used to insert new records in a table.
A field with a NULL value is a field with no value.
The UPDATE statement is used to modify the existing records in a table.
The DELETE statement is used to delete existing records in a table.
the SELECT TOP clause is used to specify the number of records to return.
The MIN() function returns the smallest value of the selected column.
The MAX() function returns the largest value of the selected column.
The COUNT() function returns the number of rows that matches a specified criteria.
The AVG() function returns the average value of a numeric column.
The SUM() function returns the total sum of a numeric column.
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