compare dates sql server

Why does the SQL Server DBA learn PowerShell? From: http://www.simple-talk.com/ SQL /database-administration/why-this-sql-server-dba-is-learning-powershell/ Joe. TJ is used only for the purpose of disseminating information. I started learning PowerShell because I was looking

parameter value changes, the SQL Server Query Optimizer may reuse the execution plan generated during the first execution. In general, we recommend that you use SP_EXECUTESQL to execute dynamic SQL statements. On the one hand, it is more flexible and can have input and output parameters. On the other hand, the query optimizer is more likely to reuse the executio

to take an index.Below to calculate the selectivity of the index, of course, the test table data is small, it may be queried even if the index, SQL Server may not be used.　　The above information can be used to calculate the index selectivity of the Fdkeyname column to110/119 = 0.924Is this still a problem? Is it a manual calculation? Here is an SQL statement to

and time in a different format. The style is the conversion style number that is provided by the SQL Server system when converting Datatime and smalldatetime data to strings, and different style numbers have different output formats.Seven, date function1. Day (date_expression)Returns the date value in Date_expression2. Month (date_expression)Returns the month value in Date_expression3. Year (date_expressio

. * SQL Server date calculationA. the first day of a monthSelect DATEADD (mm, DATEDIFF (mm, 0, getdate (), 0)B. Monday of the weekSelect dateadd (wk, datediff (wk, 0, getdate (), 0)C. The first day of a yearSelect dateadd (YY, datediff (YY, 0, getdate (), 0)D. The first day of the quarterSelect dateadd (QQ, datediff (QQ, 0, getdate (), 0)E. Last day of last monthSelect dateadd (MS,-3, dateadd (mm, datediff

threats, how to use SQL Server capabilities to deal with them, or at least reduce the exposure data to them. Data theft: Data theft includes a variety of unauthorized access to your data, from outsiders who hacked into your network, or from insiders who were illegally scanned by important people. It involves reading the excitement of prohibiting information, or being driven by the interest of a cred

If you want to query Index Server through SQL Server, you must use the OPENQUERY function. The syntax structure is as follows. OPENQUERY (pai_server, 'query ') The linked_server parameter indicates the connection name. The query parameter is the query to be performed. It is transmitted to the OPENQUERY function in the form of a string. This function returns a vir

I. Scenarios In SQL Server 2005, there is a table TestDatetime, where the data type of the Dates field is datetime. If you see a table record, what do you first think? (Figure 1: Data List) When you see this data, do you think this design is a waste of storage space and makes the index of this column increase, making the query slower, you also want to use some o

SQL Server trigger instance details, SQL trigger Microsoft SQL Server™2000 provides two main mechanisms to force business rules and data integrity: Constraints and triggers. A trigger is a special type of stored procedure, which is different from the stored procedure we intr

in mind is that the time in SQL Server is accurate to 3 milliseconds. That's why I need to subtract 3 milliseconds to get the date and time I want. SELECT DateAdd (Ms,-3,dateadd (mm, DATEDIFF (Mm,0,getdate ()), 0)) The time portion of the calculated date contains the time that a SQL Server can record the last moment

extreme is that each time the autogrow value is too small, SQL Server has to do several auto-growth to meet the operational requirements. The same size, a one step time score a few times the growth of a lot less. So the auto-growth value is not too small.In view of the above points, let us summarize:1, to set a fixed size growth, but not proportional . This avoids the unnecessary hassle of having to grow t

date functions in SQL Server: function Description GETDATE () Returns the current date and time DATEPART () Returns a separate part of the date/time DATEADD () Add or subtract a specified time interval in a date DATEDIFF () Returns a time between two dates

Tags: Using data code Time database SQLThese two days to change a SQL Server database program to Oracle, found that two of the functions between the database are many different. The DateDiff function usage in SQL Server's database is explained as follows:DescribeReturns a time interval between two dates.GrammarDateDiff (interval, date1, date2 [, firstdayofweek][,