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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.
I have developed a query, and in the results for the first three columns I get NULL. How can I replace it with 0?
In postgres, I'm getting an error when I try to union two tables where one table has a column (Amount) containing double precision data type...
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Note: A NULL value is different from a zero value or a field that contains spaces.
SQL’s NULL indicates absent data. NULL propagates through expressions and needs distinct comparison operators.
Специальное значение NULL означает отсутствие данных, констатацию того факта, что значение неизвестно. По умолчанию это значение могут принимать столбцы и переменные любых типов, если только на них не наложено ограничение NOT NULL.
Null (or NULL) is a special marker used in Structured Query Language to indicate that a data value does not exist in the database. Introduced by the creator of the relational database model, E. F. Codd...