The UNION ALL command combines the result set of two or more SELECT statements (allows duplicate values). The following SQL statement returns the cities (duplicate values also) from both the "Customers" and the "Suppliers" table
Oracle оператор UNION ALL используется для объединения наборов результатов 2-х или более SELECT запросов.
Try full joint. Select isnull(a.id,b.id) as id, a.Text1,isnull(a.ParentId,b.ParentId) parentid, isnull(a.Number,b.Number) numm,TOid from @t a. Full join @t1 b on a.Id=b.Id and a.ParentId=b.ParentId.
The SQL UNION ALL operator is used to combine the result sets of 2 or more SELECT statements. It does not remove duplicate rows between the various SELECT statements
ALL concatenates all rows, including duplicates. For best performance, use UNION ALL. Requirements. All rows of the UNION result set must be in the result set of at least one of its SELECT statements. Each SELECT statement must specify the same number of columns.
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В языке SQL операция UNION применяется для объединения двух наборов строк, возвращаемых SQL-запросами. Оба запроса должны возвращать одинаковое число столбцов, и столбцы с одинаковым порядковым номером должны иметь совместимые типы данных.
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