SQL creating view with count() function

View with count() function

In this page, we are discussing usage of aggregate COUNT() function along with the VIEW in a CREATE VIEW statement.

Example:

Sample table: customer

To create a view 'noofgrade' with two columns 'grade' and 'gradecount' of the table 'customer' with following conditions -

1. 'gradecount' column created with number of grades from the customer table,

2. unique 'grade' of 'customer' table should be grouped,

the following SQL statement can be used:

SQL Code:

CREATE VIEW noofgrade(grade,gradecount)
AS SELECT grade,COUNT(*) 
FROM customer
GROUP BY grade;

Output:

To execute query on this view

SQL Code:

SELECT * FROM noofgrade;

SQL creating view with count(), sum() and avg()

In the following, to discuss the SQL VIEW we have used the aggregate function COUNT() and SUM() and AVG() with the SQL CREATE VIEW statement.

Example:

Sample table: orders

To create a view 'ordersview' from the table 'orders' with following conditions -

1. 'c_cust_code' column must be created with COUNT(DISTINCT cust_code) from the 'orders' table,

2. 'c_ag_code' column must be created with COUNT(DISTINCT agent_code) from the 'orders' table,

3. 'c_ord_num' column must be created with COUNT(ord_num) from the 'orders' table,

4. 'avg_ord_amt' column must be created with AVG(ord_amount) from the 'orders' table,

5. 'sum_amt' column must be created with SUM(ord_amount) from the 'orders' table,

6. unique 'ord_date' must be within the group,

the following SQL statement can be used:

SQL Code:

CREATE VIEW ordersview (ord_date,c_cust_code,
c_ag_code,c_ord_num,avg_ord_amt,sum_amt)
AS SELECT ord_date,COUNT(DISTINCT cust_code),
COUNT(DISTINCT agent_code),COUNT(ord_num),
AVG(ord_amount), SUM(ord_amount) 
FROM orders 
GROUP BY ord_date;

Output:

To execute query on this view

sql Code:

SELECT * FROM ordersview; 

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