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.
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...
Пример: SELECT header, txt FROM news UNION ALL SELECT name, pass FROM members Это позволит объединить результаты из таблиц
Note: A NULL value is different from a zero value or a field that contains spaces. A field with a NULL value is one that has been
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.
I am using union all to join two result set together, e.g. select product, product_id, sales_qty from table_a union all
Each SELECT statement within the UNION ALL must have the same number of fields in the result sets with similar data types. What is the difference between
Существуют специальные операторы IS NULL и IS NOT NULL, которые позволяют