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sql union all data type error with nulls - Stack Overflow. stackoverflow. ...
Union select null, null, null, null, null, null, null from information_schema.tables.
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Does the mysql UNION and UNION ALL operator always remove rows that have a NULL in them? I am doing a UNION of two SELECT statements - one
9. Оператор UNION С оператором UNION можно делать запросы к пересечению таблиц.
Необходимые условия для операторов union и union all.
Note: A NULL value is different from a zero value or a field that contains spaces.
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 UNION clause can
Для значения стиля NULL возвращается NULL.For a style value of NULL, NULL is returned.