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.
ксф999999.9' union all select 99,2 and '0'='0 где купить в аптеках, Поиск и заказ лекарств в аптеках Санкт-Петербурга и Ленинградской области онлайн
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 this field.
union all select null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,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 works can somebody help me...
SELECT CHAR(0x66) (S) SELECT 0x5045 (this is not an integer it will be a string from Hex) (M)
The Oracle IS NOT NULL condition is used to test for a NOT NULL value.
Dataframe consisting of NULL values for each of the column will presented as dataframe with 0 observations and 0 variables (0 columns and 0