oracle pl sql select into array example

Chapter 2 procedural performance tuning of PL/SQL applications I. Reasons for PL/SQL Performance problems When the execution efficiency of PL/SQL-based applications is low, it is usually caused by poor SQL statements and programming methods,

*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

Variable introduction when writing a PL/SQL program, you can define variables and constants, including: 1 in a PL/SQL program, scalar type (scalar) 2), composite type (composite)--for manipulating a single record 3), reference type (reference)--

First, Variable introductionWhen you write a PL/SQL program, you can define variables and constants, including the following in the PL/SQL program:1), scalar type (scalar)2), composite type (composite) --for manipulating individual records3),

Grammar:identifier [CONSTANT] datatype [not NULL] [: = | DEFAULT Expr]Identifier: Used to specify the name of a variable or constant.CONSTANT: Used to specify constants. When you define a constant, you must specify its initial value, and its value

Oracle Performance Analysis 1: Enabling SQL tracking and obtaining trace files when Oracle queries encounter efficiency problems, we often need to understand the problem so as to provide solutions to the problem. Oracle provides the trace

Common SQL * PLUS commands:Conn system/rr: log on to the databaseDisc: disconnectShow user: displays the current userExit: exit the system.Clear: clear screenStart d: \ aa. SQL [arg1 arg2 arg3]: run a script and specify parameters. Replace the

[SQL] PL/SQL Syntax of Oracle and its extended data types summary PL/SQL syntax PL/SQL program consists of three parts: Declaration, execution, and exception handling. Template: [SQL] DECLARE/* variable Declaration */BEGIN/* Program subject

SQL server has been used before oracle is used. What impressed me most during the use of SQL server was its strong select statement and record concentration. The results of a select statement can be used as both a record set and a set. While the

  Where can I start learning about Oracle? Here, I will take you to the door of Oracle. One chapter a day, seven days of entry is not a dream.   1. PL/SQL PL/SQL is a procedural extension of Oracle in the standard SQL language that allows embedding