Since a NULL concatenated with a string yields a NULL, we can attempt to build our sub-string and replace a NULL with an empty string, which is then concatenated to the next part of the name. This assumes that FirstName and Surname are always NOT NULL, but you could apply the same logic to...
SELECT m.id, m.name, m.description, m.directions, COUNT(j.markerid) as marker_jingles FROM markers AS m LEFT OUTER JOIN jingles AS j ON j.markerid=m.id WHERE 1. But am a bit stuck because I cannot figure out how to get it to return rows when the COUNT is 0.
...Null,null,null,null,null,null,null,null,null,null,null,null,null,null,concat
Thank you. SELECT COUNT(*)(SELECT DISTINCT a.my_id, a.last_name, a.first_name, b.temp_val. FROM Table_A a INNER JOIN Table_B b on a.a_id = b.a_id).
Hours 1 1 2 null null null. The result must be: 3. My query is: select count(distinct hour) from hours; but it returns: 2. I tested also
SELECT id, SUM(CASE WHEN status = 3 THEN 1 ELSE 0 END) as status_3_count FROM yourtable GROUP BY id. or just use a WHERE status = 3
(M): SELECT CONCAT(login, password) FROM members. 7. Строки без кавычек Есть несколько способов не использовать кавычки в запросе, например с помощью CHAR() (MS) и CONCAT() (M). Синтаксис: SELECT 0x457578 (M). В MySQL есть простой способ представления строки в...
SELECT id, count(*), count(price>1) FROM usr GROUP BY id. Конечно, в таком виде запрос не сработает.
SELECT, FROM — обязательные элементы запроса, которые определяют выбранные столбцы, их порядок и источник данных.
Функция CONCAT предназначена для сложения строк при выборке из базы данных. Строками обычно выступают поля таблиц.