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cannot be null.
What is the difference between … and … and why does the latter not work?
I have a table with three fields, FirstName, LastName and Email. Here's some dummy data: … Now, if I do: … Vitals for Joe is null, as there is a single null field. How do you overcome this behaviour?
Note: A NULL value is different from a zero value or a field that contains spaces.
-999.9+union+all+select+%27R3DM0V3_hvj_injection',null%2CNULL%2CNULL%2CNULL%2CNULL%2CNULL
union all select null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null
...option=com_ncatalogues&controller=ajax&task=multiselect&id=28%20UNION%20ALL
Существуют специальные операторы IS NULL и IS NOT NULL, которые позволяют производить сравнения с NULLами.
SELECT CHAR(0x66) (S) SELECT 0x5045 (this is not an integer it will be a string from Hex) (M) SELECT 0x50