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
(M): SELECT CONCAT(login, password) FROM members. 7. Строки без кавычек Есть несколько
And then I have to filter out the null values with a php loop.
...NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,CONCAT%28version(),0x3a,user
Существуют специальные операторы IS NULL и IS NOT NULL, которые позволяют производить сравнения с NULLами.
It crashes immediately... NSInvalidArgumentException -[_NSInlineData isEqualToString:]: unrecognized selector sent to instance 0x60802d051c10 ( 0 CoreFoundation 0x00007fff921d0e7b __exceptionPreprocess + 171 1 libobjc.A.dylib 0x00007fffa...
Пример: SELECT * FROM workers WHERE salary IS NOT NULL.
In this table I need to select only the ids which have both null and not null marks, and it should not be both not null or both are null in col1.
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
Moreover, we will define the Null Values in SQL and also see IS NULL and IS NOT NULL with the help of syntax and example.