I have developed a query, and in the results for the first three columns I get NULL. How can I replace it with 0?
select cast (2000 as type of quint) from rdb$database select cast (2000 as int) from rdb$database. If TYPE OF is used with a (VAR)CHAR type, its character.
Note: A NULL value is different from a zero value or a field that contains spaces.
-999.9+union+all+select+%27R3DM0V3_hvj_injection',null%2CNULL%2CNULL%2CNULL%2CNULL
If I have this - tadd is the Address table: … Is there a way to exclude the apt_number if it doesn't exist? I was thinking of: … But it will return only those rows with apt_number...
Существуют специальные операторы IS NULL и IS NOT NULL, которые позволяют производить сравнения с NULLами.
Предикат IS NULL позволяет проверить отсутствие (наличие) значения в полях таблицы. Использование в этих случаях обычных предикатов сравнения может привести к неверным результатам, так как сравнение со значением NULL дает результат UNKNOWN (неизвестно).
In general, R supports: NULL NA NaN Inf / -Inf NULL is an object and is returned when an
SELECT CONCAT(CAST(int_col AS CHAR), char_col); CONCAT() returns NULL if any argument is NULL. A NULL parameter hides all information contained in other parameters from the result. Sometimes this is not desirable; to avoid this, you can
SELECT id, name, CAST(id AS CHAR(200)) FROM employees WHERE manager_id IS NULL UNION ALL SELECT e.id, e.name, CONCAT(ep.path, ',', e.id) FROM