executing sql directly no cursor

During database development, when you retrieve data that is only a single record, the transaction statement code that you write tends to use the Select INSERT statement. But we often encounter situations where one record is read from one result set

*sql optimization based on ORACLE11GR2 reading notes * Third, cursor in OracleThe cursor in Oracle is a vector of SQL parsing and execution in an Oracle database and is a data structure for C (Oracle is written in C).There are two types of cursor in

Cursor Overview of Cursors I believe many Delphi programmers have written this code: ... Begin Mydataset.open; Mydataset.frist; While isn't (MYDATASET.BOF or mydataset.eof) do Begin ... End Mydataset.close; End ... For a long time, we

With cursors, and while you can traverse each record in your query and pass the required fields to the variable for handling accordingly ================== DECLARE @A1 VARCHAR (a), @A2 VARCHAR (a), @A3 INT DECLARE CURSOR youcurname for

Understanding cursors (1): An Overview of cursors eygle says that database activities are mainly about the importance of the cursors active cursors. As a result, I have made a series of articles, step-by-Step learning of cursors the first article is

server| Create | Stored procedure stored procedures can make it much easier to manage the database and to display information about the database and its users. Stored procedures are precompiled collections of SQL statements and optional control flow

MS SQL Server Query optimization methodThere are many reasons for the slow speed of queries, which are common1, no indexes, or no indexes (this is the most common problem with query slowness, is the flaw in programming)2, I/o throughput is small,

SQL advanced application1. Use of Embedded SQLSQL is a non-procedural, set-oriented data manipulation language. Most of its statements are independent of context conditions. In transaction processing, process control is often required, that is, the

13. T-SQL and SQL query AnalyzerWhat is SQL?What is T-SQL?Introduce new features of T-SQLHow to Use T-SQLSummaryIn this chapter, we will introduce some basic concepts about the Structured Query Language and transact-SQL and their differences. This

SQL statement optimization principles:◆ 1. Use indexes to traverse tables fasterThe index created by default is a non-clustered index, but sometimes it is not optimal. In a non-clustered index, data is physically stored on the data page randomly.