AND COLUMN10 IS NULL ORDER BY COLUMN11 END ELSE BEGIN SELECT DISTINCT value = COLUMN1 ,display = COLUMN2 FROM dbo.TABLE1 m INNER JOIN dbo.TABLE2 s ON s.COLUMN3 = m.COLUMN4 INNER JOIN dbo.TABLE2 lm ON lm.COLUMN5 = s.COLUMN6 WHERE lm.COLUMN7 = 1 AND COLUMN8 = 1 AND COLUMN9...
the most common reason for the error would be database to connect has not been set properly ALTER AN EXISTING TRIGGER TO ADD A NEW COLUMN Alter collate of master database Alter Coulmn takes long time to complete Alter foreign key column to not Allow null question Alter Multiple Procedures ...
Most aggregate functions eliminate null values in calculations; one exception is the COUNT function. When using the COUNT function on a column containing NULL values, the NULL values will be eliminated from the calculation. However, if the COUNT function is used with an asterisk, it will count ...
SELECTTestPlus=tmp.Test1+tmp.Test2,TestMinus=tmp.Test1 – tmp.Test2FROM(SELECTTest1=SUM(myColumn),Test2=AVG(myColumn)FROMmyTableGROUPBYmyColumn)tmp; Copy In the query above, the query between brackets is the subquery or theinner query. It has the aliastmp. Theouter queryselects from the i...
One logical way to perform this comparison is to UNPIVOT the 3 columns’ values into one column and then use the MAX aggregation function to get the latest date value. As Jingyang showed, it is easy to use the UNPIVOT clause to transpose the multiple column data int...
Suppose you have a CHECK constraint in a table to require that the salary column be greater than zero. A row entered into the table with a NULL salary is accepted, because (NULL > 0) is UNKNOWN and treated like TRUE in the CHECK constraint. A comparison between two NULLs in filters yie...
Why? There was no need to test the condition on the Type column separately.code 复制 -- Better: Use the 2nd Parameter instead of an AND - Same results but neater SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'dbo.MyTable', N'U') ...
Replace any continuous series of repeating spaces of in a database column with a single space. Constraints: Although aCLR UDF using .NET’s regular expression libraryis the most straightforward way to do this, the original article went for a pure SQL approach so I did the same. ...
An email needs to have all the above parts to make it valid. Therefore something like this '_%@_%._%'. The email cannot contain spaces. It cannot contain some special characters like #, %. It is not allowed by some domains.
although I agree with you in principle a function will cover bad design - if you mean zero then zero should be what is in the column; I think the point here is that NULLs are a quick/dirty solution which allows DB developers to play and should not exist in production databases. Rule...