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.
Note: A NULL value is different from a zero value or a field that contains spaces.
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 header, txt FROM news UNION ALL SELECT name, pass FROM members This will combine results from both news table and members table and return all of them. Another Example: ' UNION SELECT 1, 'anotheruser', 'doesnt matter', 1--. UNION – Fixing Language Issues.
Each SELECT statement within the UNION ALL must have the same number of fields in the result sets with similar data types.
I am using union all to join two result set together, e.g. select product, product_id, sales_qty from table_a union all
R language supports several null-able values and it is relatively important to understand how these values behave, when making data pre-processing and
Существуют специальные операторы IS NULL и IS NOT NULL, которые позволяют производить сравнения с NULLами.
...Id=13 and 0=1 Union Select null,null,null,null,null,null,null,null-- Again we got a error : The text data type cannot be selected as DISTINCT
union all select null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null