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.
I have developed a query, and in the results for the first three columns I get NULL. How can I replace it with 0?
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
Hours 1 1 2 null null null. The result must be: 3. My query is: select count(distinct hour) from hours
What is the difference between … and … and why does the latter not work?
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: …
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...
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 -- test all nulls --*/ ). A. DECLARE @ColumnDynamicSQL nvarchar(MAX)