we want to calculate the average marks scored in each course. To keep things simple, we’re only saving the grades of the students who passed the test. To pass the test, students need to get at least a D. So, we want to avoid the divide-by-zero error for courses where there is ...
根据实际情况,可在外面再加ISNULL,CAST函数。 说明:SELECTCOALESCE(dividend/NULLIF(divisor,0),0)FROMsometable For every divisor that is zero, you will get a zero in the result set. 引用:http://stackoverflow.com/questions/861778/how-to-avoid-the-divide-by-zero-error-in-sql...
How to avoid group by many columns How to avoid null values in PIVOT result set How to calculate campdate > todays date + 45 days in sql query How to calculate max value for decimal type how to calculate MTD, QTD and YTD how to calculate the fiscal month start and end dates based ...
Avoid using these data types in new development work, and plan to modify applications that currently use them. Use nvarchar(max), varchar(max), and varbinary(max) instead. Updating large value data types Use the .WRITE (expression,@Offset,@Length) clause to perform a partial or full update...
Avoid using them in new development work, and plan to modify applications that currently use them. Specifying the TABLOCK hint on a table that is the target of an INSERT statement has the same effect as specifying the TABLOCKX hint. An exclusive lock is taken on the table. (column_list) ...
You can avoid this risk by omitting the password, and entering it only when the system prompts for it. You have the option of entering logon. If you do not specify logon but do specify start, SQL*Plus assumes that the first line of the script contains a valid logon. If neither ...
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Avoid mixed-mode expressions, and beware of implicit type conversions. When you want to use an index on theVARCHAR2columncharcol, but theWHEREclause looks like this: AND charcol =numexpr wherenumexpris an expression of number type (for example, 1,USERENV('SESSIONID'),numcol,numcol+0,......
Windows dispatched the thread to run on the second CPU (CPU 2). The SQL Server worker thread completed running on CPU 2. Because of CPU drift, the end tick value that was captured from CPU 2 was 1900 instead of 900. You can...
how to avoid duplicates in CROSS JOIN Query How to avoid group by many columns How to avoid null values in PIVOT result set How to calculate campdate > todays date + 45 days in sql query How to calculate max value for decimal type how to calculate MTD, QTD and YTD ho...