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sql语句中日期时间格式化查询（Date and time formatted query in SQL statement）.doc
sql语句中日期时间格式化查询（Date and time formatted query in SQL statement）
Edit delete | date time format SQL statement in the query
Snow tiger published: 2007-12-14 13:48
Today in search of member management system, I found that the search time is not very scientific, efficiency is not too high. Especially when searching the same time specified in the database, I have such a time format 2007-5-22 14:32:12 when we are in the query whether 2007-5-22 and its result is equal. Not equal.
We all like to find other ways to solve this problem. But I found that our methods werent very good, because we sometimes had SQL Sever
You dont know enough about the sentence features. So I checked the SQL Server help, and finally found a good thing, you can solve this problem
The CONVERT function can solve this problem by formatting the time like 2007-5-22 14:32:12 in the query or where clause: 2007-5-22;
As follows:
I will check the registration time of the user UserRegisterTime
Select * from [user] where UserActive=0 and replace (CONVERT (char (10), UserRegisterTime, 111), =2007-05-22order by, -) UserRegisterTime desc
In this key sentence
Replace (CONVERT (char (10), UserRegisterTime, 111), /, -);
Why do I want replace to change the / symbol in convert to -? Because the formatting time of convert here is: 2007/05/22
One more thing to note: the formatting time of convert is in the form of 0 before, such as 2007-1-1 12:12:31:
2007-01-01, so before you query, its necessary to add 0 to the number of months and days less than 10 (excluding 10) in your date,
For example: 1 should be 01
The specific usage of this number is as follows:
Transformation function
When Microsoft? SQL Server? 2000 does not automatically perform expression transformations of different data types, conversion functions CAST and CONVERT can be used to convert them. These transformation functions can also be used to obtain various special data formats. These two transformation functions can be used to select lists, Where clauses
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