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.
Then in the second table I have select ..., null as opt from... I know that I could have an empty string with '' as opt however, I don't want an empty string, I really do need it to be null.
2018-12-04 {\x22visitorId\x22: null, \x22pageSize\x22: 36, \x... 2018-12-04 i \x63\x61nt ti\x65n ti\x65n 2018-12-04 \x2f\x01\x69\163\151\x62\x69\154it\171 2018-12-04 \x65m ko th\x65 \.
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...
-999.9+union+all+select+%27R3DM0V3_hvj_injection',null%2CNULL%2CNULL%2CNULL%2CNULL%2CNULL
The IS NULL operator is used to test for empty values (NULL values). The following SQL lists all customers with a NULL value in the "Address" field: Example. SELECT CustomerName, ContactName, Address FROM Customers WHERE Address IS NULL
The Oracle IS NOT NULL condition is used to test for a NOT NULL value. You can use the Oracle IS NOT NULL
Ken Sanchez NULL * Terri Duffy NULL * Roberto Tamburello NULL * Rob Walters NULL * Gail Erickson