how to tune sql query in oracle

Tags: data SP problem BS database server SQL as installationWhen SQL Server accesses a database table in Oracle remotely:The remote syntax is typically: SELECT * from OpenQuery (Oracle linked server name, ' query statement ')Eg:select * from OPENQUERY (QTX, ' select * from s

The best way to learn is practice! Therefore, my learning is based on practice. The most basic SQL statement is the query statement. The best way to learn is practice! Therefore, my learning is based on practice. The most basic SQL statement is the query statement. Preface The best way to learn is practice! Theref

Oracle SQL classical query expert Article 4 Oracle SQL classical query expert Article 4 This article is the fourth article on typical query of OracleSQL. It is just the author's own opi

The paging query method for Oracle, SQL, and DB2 is different from that for paging query statements in Oracle and SQL, the following describes the differences between DB2 paging query a

One: The value of the field of the query string type is NOT NULL for SQL:[SQL]View Plaincopy SELECT * from tb_cms_flgtinfo_a t where (T.fsta are not null and t.fsta '); Main: The above tb_cms_flgtinfo_a is the table name, Fsta is the field in the tableTwo: The query string Type field has a null value f

Many of my friends who use mysql limit for paging to oracle do not know how to write paging. In fact, oracle paging is similar to mssql paging. Next I will introduce oracle paging statements. Simplest use The Code is as follows: Copy code Select t2 .*From (select rownum r, t1. * from youtable t1 where rownum Where t2.r>? If the numb

Oracle Real-Time query resource consumption SQL 1. first, use the top command to view the pid Number with more resources in production. Note: For the oacle of the top Command user, follow the pid www.2cto.com 2. query the current time-consuming session ID, user name, And sqlID. Among them, the pid in top is the spid fi

A detailed explanation of the Double quotation marks required for table names and Field Names during oracle SQL statement Query As a beginner in oracle, I believe everyone will encounter this problem, It is clear that navicat created a table visually, but it cannot be found! Why? Select * from user; However, if we add

* fromEmpwhereEmpno not inch(SelectEmpno fromEmpwhereRowNumSize*(page- 1)) andRowNumsize; --sorting and then paging query --number of data after sorting (Efficiency row 2nd) Select * from(SelectRowNum RN, D.* from(Select * fromEmpOrder bySaldesc) d)whereRn> 5 andRn One; --Paging function: row_number function (1th efficiency row) SelectRow_number () Over(Order bySaldesc) RN, EMP.* fromEMP; --page Out Select * from(SelectRow_numbe

Page Size *From table1where id>(select Max (ID) from(Select Top ((page 1) * page size) ID from table1 ORDER by ID) as T)ORDER BY IDHow much of this method does not always have a big drop, the stamina is still very sufficient. Especially when the data volume is large, the execution speed of the method is not reduced at all.Using top requires that the primary key must be unique and cannot be a federated primary key. If it is a federated primary key, the query