CONVERT (Data_type,expression[,style])CONVERT (varchar (10), field name, conversion format)DescriptionThis style is typically in the time type (Datetime,smalldatetime) and the string type (Nchar,nvarchar,char,varchar)It is only used when converting
In SQL Server, I often need to perform some time-type field conversions, but I don't quite remember it. So I collected the following sqlserverconvert datetime-related materials and posted them on my site, it is convenient for you to search for it
Int
(1). 4 byte storage, the length of the int is 4 bytes, the storage space is less than datatime, the int index storage space is also relatively small, the sorting and the query efficiency is relatively higher a little(2) The readability is
First, review the syntax format of CONVERT (): convert ([length], [, Style])
Second, here pay attention to the meaning of style: style is the conversion of datatime and smalldatetime data to a string by the SQL Server system provided by the
usually storage time with datetime type, and now many systems also use int storage time, what difference do they have? Individuals prefer to use int this is good for date calculations, so let's look at the kind of things that would be better. int(1).
After the datetime type is passed into Asp.net Ajax, the time will change to the zero time zone. In other words, the time is 8 hours less than the time in China.
For example:Custom type myorderFor more information about how to use custom types in
In the project development process, we often have to do some time-based queries, such as querying the history of the specified time range, but these times are passed from the UI parameters, so we write the SQL statement must use the string
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