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
What is the difference between … and … and why does the latter not work?
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: …
Note: A NULL value is different from a zero value or a field that contains spaces.
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...
Union select null, null, null, null, null, null -- test all nulls --*/ ). A. DECLARE @ColumnDynamicSQL nvarchar(MAX)
The IS NOT NULL condition is used in SQL to test for a non-NULL value.