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Union select null, null, null, null, null, null, null from information_schema.tables.
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?
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.
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A field with a NULL value is a field with no value. If a field in a table is optional, it is possible to insert a new record or update a record without adding a
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).
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i am trying to do union i get data with null values and i want do not want it to show in result. such as: column1 col2 col3 col4 col5 col6 test1 1 2 3 null 6 test2 2
The UNION ALL operator is employed to combine the results of 2 select statements as well as duplicate rows. The same rules that apply to the
IS NULL вернёт истину, если операнд имеет значение NULL и ложь, если он им не является.