select a,b,null,null from table1 union select null,null,c,d from table2 union select null,null
Union select null, null, null, null, null, null, null from information_schema.tables. for a small database containing three tables. this instruction is used in sql injection I tried it and it worked but I didn't really know how it...
I have an object of type Foo. Foo has an Id (int) a) Is the code bellow "good"? b) What should I return if both are null? … EDIT: c) Should the Equals method call the == operator, or viceversa?
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 value to
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NULL значения представляют отсутствуют неизвестные данные. Колонка по умолчанию, таблица может храниться NULL значения.
In this video, I have explained about the NULL and NOT NULL values to find in the columns.
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