​
Overview

The BOOL_AND() function calculates all the boolean values in the aggregated group, which will have these results:

  • true if all the values are true for every row.

  • false if at least one row in the group is false.

The input and the return type must be in BOOL.

NULL values are not aggregated, so it will return NULL if there are zero input rows.

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Examples

In this example, we will use a payment table that stores details of the orders, whether the order has been paid or unpaid by the customer:

CREATE TABLE payment (
    orderid int,
    custname text,
    orderproduct text,
    ordertotal real,
    paid boolean
);
INSERT INTO payment (orderid, custname, orderproduct, ordertotal, paid)
VALUES 
(9557411, 'Maya', 'Jeans', 10.5, true),
(9557421, 'Aaron', 'T-Shirt', 9.2, true),
(9557451, 'Alex', 'Hat', 10.8, true),
(9557311, 'Will', 'Hat', 8.5, true),
(9557321, 'Will', 'T-Shirt', 12.15, true),
(9557351, 'Maya', 'T-Shirt', 9.5, true),
(9557221, 'Maya', 'Jeans', 11.02, true),
(9557251, 'Alex', 'Jeans', 11.09, true),
(9557231, 'Aaron', 'Hat', 14.56, false),
(9557281, 'Aaron', 'Hat', 12.15, true),
(9557291, 'Will', 'T-Shirt', 13.1, true);

SELECT * FROM payment;

The above query will show the following table:

+----------+-----------+---------------+-------------+-------+
| orderid  | custname  | orderproduct  | ordertotal  | paid  |
+----------+-----------+---------------+-------------+-------+
| 9557411  | Maya      | Jeans         | 10.5        | t     |
| 9557421  | Aaron     | T-Shirt       | 9.2         | t     |
| 9557451  | Alex      | Hat           | 10.8        | t     |
| 9557311  | Will      | Hat           | 8.5         | t     |
| 9557321  | Will      | T-Shirt       | 12.15       | t     |
| 9557351  | Maya      | T-Shirt       | 9.5         | t     |
| 9557221  | Maya      | Jeans         | 11.02       | t     |
| 9557251  | Alex      | Jeans         | 11.09       | t     |
| 9557231  | Aaron     | Hat           | 14.56       | f     |
| 9557281  | Aaron     | Hat           | 12.15       | t     |
| 9557291  | Will      | T-Shirt       | 13.1        | t     |
+----------+-----------+---------------+-------------+-------+

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#Case 1: BOOL_AND with a false result

We will find out if all customers have paid for their orders using the query below:

SELECT BOOL_AND(paid) AS "final_result" FROM payment;

In the BOOL_AND function, if there is at least one FALSE value, the overall result will be FALSE. The final output shows that there is an order that hasn’t been paid.

+--------------+
| final_result |
+--------------+
| f            |
+--------------+

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#Case 2: BOOL_AND with a true result

We will find out if Maya has paid for her orders using the query below:

SELECT BOOL_AND(paid) AS Maya_Paid
FROM payment
WHERE custname ='Maya';

In the BOOL_AND function, if all values are TRUE, then the overall result will be TRUE. The final output shows that Maya has paid all her orders.

+------------+
| maya_paid  |
+------------+
| t          |
+------------+
AVGBOOL_OR