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Union select null, null, null, null, null, null, null from information_schema.tables.
select a,b,null,null from table1 union select null,null,c,d from table2 union select null,null,null,null,e,f from table3.
SELECT DISTINCT(provider) FROM (SELECT title, provider FROM financials_raw. UNION. SELECT title, provider from sales_raw ) combined. WHERE title = 'Home'. However, this will return NULL provider results as well, how would I exclude all null results?
The IS NULL operator is used to test for empty values (NULL values). The following SQL lists all customers with a NULL value in the "Address" field: Example. SELECT CustomerName, ContactName, Address FROM Customers WHERE Address IS NULL
select number, text from test_table union select number, text from test_table_2. Как Вы видите, вывелось всего 5 строк, так как у нас первая строка в первом запросе и первая строка во втором запросе одинаковые, поэтому они объединились. Теперь давайте объединим через union all.
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).
second row have null values in 11,22,24 columns.....etc for all the other 600 rows. I need to select the data which do not have null values.
NULL is special in SQL. NULL indicates that the data is unknown, inapplicable or even does not exist. In other words, NULL represents that the data is missing in the database. For example, if an employee does not have any phone number, you can store it as an empty string.
select decode( null , 1, 'ONE' , null, 'EMPTY' -- это условие будет истинным