Oracle

Use left join instead of not in or not exists SQL code www.2cto.com and use left join. As a result, the value of TempColum in the testb table is NULL: SQL> SELECT. *, B. id "TempColum" FROM testa a left join testb B ON. id = B. id; id value

Oracle tablespace query and operations 1. query the usage of oracle tablespace www.2cto.com select B. file_id File ID, B. tablespace_name tablespace, B. file_name physical file name, B. total bytes, (B. bytes-sum (nvl (. bytes, 0) used, sum (nvl (.

Oracle obtains the maximum DATE SQL code www.2cto.com -- Created on 2010/06/08 by NAN declare -- Local variables here TYPE t_test IS TABLE OF DATE INDEX BY BINARY_INTEGER; v_test t_test; v_date DATE; BEGIN -- Test statements here v_test (1): = '00000

Method 1 of oracle sequence export: execute the following SQL: SEQUENCE_OWNER = 'database login username'; www.2cto.com SELECT 'create sequence username. '| SEQUENCE_NAME | 'minvalue' | MIN_VALUE | 'maxvalue' | MAX_VALUE | 'start with' | LAST_NUMBER

1. Cold backup copies all database files to another directory when the database is closed. Here, you can perform some operations on the database (such as creating a table and inserting corresponding values into it, mainly to achieve the effect after

Use SQL to recursively query whether the primary key parent node is named to describe the leaf www.2cto.com node RES_CAT_ID IS_LEAFNODE 1 127f 1 0 Agricultural Science 0 06-12 months-12 03.52.09.074000 PM 3 127f 1 0 plant protection 0 06-12 months-12

Use the system package DBMS_ALERT to monitor the table DBMS_ALERT and support asynchronous database event capturing. www.2cto.com is now testing the changes in the captured table. The test table is emp. because it is asynchronous, we need to open

In Oracle, loop www.2cto.com is the simplest loop statement in plsql. This loop statement starts with loop and ends with end loop, this loop will be executed at least once, that is, the first loop is used to judge the case: Write a process, enter

In oracle, jobs are used to periodically execute Task 1. view the jobselect job in the oracle database, what from user_jobs; 2. delete jobexecute dbms_job.remove (jobID) in oracle. Note: jobID is the job value queried in "select job, what from

What is dual in oracle? What is dual? A: www.2cto.com dual is a system table and cannot be deleted or modified. Its name is "pseudo table" or "dumb table ". Check its table structure: is the name of SQL> desc dual empty? Type ----------- -------- ---

Create or replace function hello www.2cto.com /**************************** * ***************************** Author: fuqiang WX155924 Version: v1.00 Date: 2013-01-06 Description: move a directory ************************************* * ***************

Today, I was counting a piece of data at work. At first, the SQL statement was successfully executed, but then the user adjusted the requirements slightly. I thought it would be possible to add a query condition, the result is generated after more

Oracle10g backup set Compression new feature (Backupset Compression) Oracle10g allows you and the BACKUP command to compress the BACKUP set using the as compressed backupset statement. This compression backup does not need to be decompressed during

AutoTrace execution result Description: statistical information of the SQL code www.2cto.com listen 299 recursive cballs 0 db block gets 2359 consistent gets 0 physical reads 0 redo size 410 bytes sent via SQL * Net to client 385 bytes encoded ed

Oracle: bitmap index and deadlock-2 The bitmap index is stored as a compressed index value, which contains a ROWID in the range, therefore, ORACLE must lock the ROWID in all ranges for a given value. Row-level locking is not supported. Another

Description: Environment: oracle10.2.0.5 RAC + HP-UX use the analyze index validate structure statement to verify the degree of fragmentation of the index, then, we can query through the index_stats view. How much impact does this statement have on

Oracle Listener static configuration, dynamic registration, and LOCAL_LISTENER question 1.1. oracleListener static service configuration and dynamic service registration 1.1.1 what is service registration first some basic concepts: Oracle instance,

Oracle installation fails to use the command/usr/bin/xdpyinfo to automatically check the display color. Use the root user [root @ dev ~] # When xhost + can install Oracle on www.2cto.com on Linux, the following error is often reported: The

SQL optimization series (1) _ SQL Optimization-where clause optimization 1. Why is it necessary to optimize SQL statements in an important aspect of system optimization. For massive data, the speed difference between inferior SQL statements and high-

[SQL] www.2cto.com -- function: This function uses a combination of stored procedures and types to Perform Batch operations, saving system overhead and improving efficiency. -- CREATE Type bodies create or replace type TYPE_ARRAY as object (id