use convert function to run query

In VC ++ 5.0, The WinInet class of MFC encapsulates relevant win32 API functions for programming in internet client programs. In this way, the internet client program can be compiled without understanding the details of winsock or TCP/IP. In this

Oracle XQuery query, build, and convert XML (1) In Oracle databases 10 G In version 2nd, Oracle introduces a fully functional built-in XQuery Engine Integrated with the database, which can be used to complete various tasks related to the

Ways to improve query speed with data above millions:1. Try to avoid using the! = or <> operator in the WHERE clause, or discard the engine for a full table scan using the index.2. To optimize the query, avoid full-table scanning as far as possible,

MySQL Query performance optimizationThe optimization of MySQL query performance involves many aspects, including library table structure, establishing reasonable index and reasonable query. The library table structure includes how to design

Cause Analysis and Solution of slow SQL query speed, and cause analysis of slow SQL query speed Cause Analysis and Solution for slow SQL query speed There are many reasons for slow query speed. The following are common causes:　　1. No index or no

Ways to improve query speed with data above millions:1. Try to avoid using the! = or <> operator in the WHERE clause, or discard the engine for a full table scan using the index.2. To optimize the query, avoid full-table scanning as far as possible,

This topic describes how to query the Microsoft SharePoint Foundation list using the LINQ to SharePoint provider. Step 1: obtain a reference to a website The datacontext object must be created to write the code for the LINQ to SharePoint provider.

SyntaxUse CAST: CAST (expression AS data_type) Use CONVERT: CONVERT (data_type [(length)], expression [, style]) ParametersExpression Is any valid Microsoft SQL Server "expression. For more information, see expressions. Data_type The data types

This post is only for sharing knowledge. It is more concise (that is, a version without English) and will be published on the blog. I am reviewing this article. I hope this post will be helpful for your learning of the LINQ to SQL

High Performance MySQL Reading Notes-query performance optimization, high performance mysql For high-performance database operations, it is not enough to design the optimal database table structure and build the best index. You also need to design