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.
Select null, 'Actual null' from dual union all select '', 'Null string' from dual union all select ' ', 'single
Hours 1 1 2 null null null. The result must be: 3. My query is: select count(distinct hour) from hours
I need a list with three columns. column 1st and 3rd having values while 2nd as null. Can I do it through HQL query? I need something like this: …
How can I run a MySQL query that selects everything that is not null? It would be something like … Do I just remove the all and go..?
What is the difference between … and … and why does the latter not work?
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...
R language supports several null-able values and it is relatively important to understand how these
Null (or NULL) is a special marker used in Structured Query Language to indicate that a data value does not exist in the database. Introduced by the creator of the relational database model, E. F. Codd...