Oracle enhanced grouping Functions

Oracle enhanced grouping Functions The ROLLUP () function is an extension of group by grouping statistics, which can achieve the sum of GROUP statistics. Now let's start preparing our testing environment. -- Create a new table employee_salary to

PL/SQL storage functions and stored procedures

PL/SQL storage functions and stored procedures Oracle provides the ability to store PL/SQL programs in databases and run them anywhere. This is called a stored procedure or function.Procedures and functions are collectively referred to as PL/SQL

Oracle locks the temporary table statistics and whether the hint can be dynamically collected after the lock

Oracle locks the temporary table statistics and whether the hint can be dynamically collected after the lock The statistical information of the global temporary table cannot be collected. If it is collected, its statistical information must be 0,

PL/SQL cursor usage

PL/SQL cursor usage Use of cursors ① Cursor ConceptTo process SQL statements, Oracle must allocate a region called context area to process required information,This includes the number of rows to be processed, a pointer to the expression after the

Innobackupex full backup database

Innobackupex full backup database For MySQL Database Hot backup, xtrabackup is the best choice except MySQL enterprise backup. This tool provides Hot Backup Based on the innodb Storage engine, supports full, Incremental backup, partial backup, point-

In Linux, MySQL reports the Table 'xxx' doesn' t exist error. How can this problem be solved?

In Linux, MySQL reports the Table 'xxx' doesn' t exist error. How can this problem be solved? In Linux, MySQL reports the Table 'xxx' doesn' t exist error. How can this problem be solved? Problem: The program reports the error of Table 'xxx' doesn'

ORA-600 [13013] handling process

ORA-600 [13013] handling process Record one ORA-600 [13013] Process A ORA-600 [13013] error was found in the alert Log after a database exception was completed Thu Mar 08 23:29:37 2012 Errors infile/opt/Oracle/diag/rdbms/chf/trace/chf_smon_24137.trc

Oracle analysis function PERCENTILE_CONT

Oracle analysis function PERCENTILE_CONT Query the salaries of people with the salary distribution of 25%, 50%, and 75% in each department. percent_rank () is the relative position in the ranking. Create table EMP(Empno number (4) not null,ENAME

Deploy custom Observer Coprocessor in Hbase0.98.4

Deploy custom Observer Coprocessor in Hbase0.98.4 Hbase supports Coprocessor (Coprocessor) Since 0.92. It is designed to enable users to run their code on the regionserver, that is, to move the computing program to the location where the data is

SQL data types in Oracle

SQL data types in Oracle Data types are the basis of data storage for each programming language. They are also a benchmark for the implementation of programming languages. Some programming languages may have a wide range of data types, such as java,

How to configure an ACL report ORA-24247

How to configure an ACL report ORA-24247 Preface: ORA-24247 errors when sending messages to external via Oracle 11, detailed error messages are as follows: ERROR at line 1: ORA-24247: network access denied by access control list (ACL) ORA-06512: at "

Detailed description of MySQL table structure modification

Detailed description of MySQL table structure modification MySQL alter table syntax======================================Add column [add column name]======================================① Alter table name add column name column type column

Oracle uses handles for non-Backup Recovery in specific scenarios

Oracle uses handles for non-Backup Recovery in specific scenarios In dba's work, backup is the foundation of all work. If there is no backup, it would be difficult to recover the data easily. If the business data requirements are high, resulting in

ORA-30009: connect by memory insufficient

ORA-30009: connect by memory insufficient Today in the Oracle 11G environment manufacturing data encountered ORA-30009: connect by Operation memory is insufficient, 10g began to support XML, changed to xmltable can be. SQL> drop table t_range purge;

Destructive Testing of dual tables

Destructive Testing of dual tables With regard to dual table destructive testing, since it is a destructive test, it needs to be determined that this test is limited to testing or personal learning, and some SQL statements may seem extremely simple,

Enable MySQL remote connection in Linux

Enable MySQL remote connection in Linux How to enable MySQL remote connection in Linux. By default, the root user of MySQL can only access MySQL locally and cannot remotely connect to and manage MySQL databases. How can I enable MySQL remote

PL/SQL Exception error handling

PL/SQL Exception error handling A good program should be able to correctly handle all kinds of errors and recover from errors as much as possible. Oracle provides EXCEPTION and exception handler for error handling. -----------------------------------

Introduction to PL/SQL Program Design

Introduction to PL/SQL Program Design ① PL/SQL program design overview PL/SQL is an advanced database programming language used to access Oracle databases in various environments. Since the language is integrated into the database server, PL/SQL

PL/SQL triggers

PL/SQL triggers PL/SQL triggers Triggers are a technology provided by many relational database systems. In the Oracle system, triggers and similar procedures and functions have PL/SQL blocks that declare, execute, and handle exceptions. ① Trigger

About semi-join in Oracle

About semi-join in Oracle Table join is particularly important in SQL statements. External connections, internal connections, semi-connections, anti-connections, and other connections, there are still a lot of details in a simple connection. It is

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