### BOOL\_AND 
```sql
bool_and([distinct] expr)
```
####  Description

The BOOL\_AND function is used to determine whether a set of boolean values (expr) are all true. When all given boolean values are true, the function returns true; otherwise, it returns false. If the distinct keyword is set, the function will only evaluate unique boolean values.

#### Parameter Description

* expr: The boolean expression to be logically ANDed.

#### Return Type

Boolean value.

#### Usage Example

1. Determine if all boolean values are true:
```sql
SELECT bool_and(col) FROM VALUES (true), (true), (true) AS tab(col);
+---------------+
| bool_and(col) |
+---------------+
| true          |
+---------------+
```
2. Cases with null values:
```sql
SELECT bool_and(col) FROM VALUES (true), (true), (null) AS tab(col);
+---------------+
| bool_and(col) |
+---------------+
| true          |
+---------------+
```

3. Use the distinct keyword to determine if all boolean values are true after deduplication:

```sql
SELECT bool_and(DISTINCT col) FROM VALUES (true), (true), (true) AS tab(col);
+------------------------+
| bool_and(DISTINCT col) |
+------------------------+
| true                   |
+------------------------+
```

4. Cases that include false values:
```sql
SELECT bool_and(col) FROM VALUES (false), (true), (null) AS tab(col);
+---------------+
| bool_and(col) |
+---------------+
| false         |
+---------------+
```
5. Only contains one true value and one false value:
```sql
SELECT bool_and(col) FROM VALUES (true), (false) AS tab(col);
+---------------+
| bool_and(col) |
+---------------+
| false         |
+---------------+
```