Web这可能很容易，但是无论如何我还是坚持不懈，而且我的搜索没有任何有用的东西。 我有目前采用这种格式的数据： 有很多可能的代码，但是我需要查询以以下格式显示前十个 即 … WebIndexes are used to retrieve data from the database more quickly than otherwise. The users cannot see the indexes, they are just used to speed up searches/queries. Note: Updating a table with indexes takes more time than updating a table without (because the indexes also need an update).

SQL : How can I alter this computed column in SQL Server 2008?

WebRocket Unidata, Microsoft Access, MySQL. • Programming Languages: T-SQL, Windows Scripting, Google Apps Script, Envision Basic. 📧 Connect with me at [email protected] … Web8 apr. 2024 · Assuming you are using MySQL (as the question is tagged), the following will return an arbitrary value for the other columns: select * from t group by code; Copy. … foot pedal hs code

SQL Server - index on a computed column? - Stack Overflow

Web1 Answer Sorted by: 12 Yes it is possible to do this, but not with the syntax you used. The key is that you need to create a computed column in the table and then index that: … Web4 apr. 2008 · USE [myDatabase] GO CREATE FUNCTION dbo. myGetLength ( @data image) RETURNS int WITH SCHEMABINDING AS BEGIN RETURN datalength ( @data ); END GO CREATE VIEW V1 WITH SCHEMABINDING AS SELECT [pkId], dbo. myGetLength ( [imData]) AS nCount FROM dbo. T1; GO create unique clustered index … WebFortunately, SQL Server provides us with a feature called computed columns that allows you to add a new column to a table with the value derived from the values of other … foot pedal hand sanitizer dispenser