Oracle

I. Demand Current time: 2018-1-6 16:56:01Because of the data in the database at the beginning of last year, that is (2017-1-1 00:00:00) and the end of last year (2017-12-31 23:59:00), the two time periods: ii. results 1, obtain early last year (2017

Truncate is a unique keyword in Oracle! Its role is to clear a table, in the deletion of data, it has some differences with the delete, so that they can remember:1. Functionally, truncate is the content of a table, which is equivalent to delete from

After the Oracle installation is complete and sometimes cannot connect using the IP address or cannot connect at all, we can solve this problem by configuring the monitoring of Oracle;Locate the net Manager for the Oracle folder in the Start menu,

when we have finished installing the Oracle database, we will be thinking about connecting with the visualizer, Navicat is our common tool for visualizing connected databasesWhen we finish installing the Oracle database, we need to start himStart

Oracle stored procedure Call dynamic sqlcreationtime--2018 August 16 11:25 author:marydon1. Error implementation mode--Start time stitching ' 00:00:00 ' v_sql: = ' Select decode (Length (' | | | V_end | | '), 10, ' | | ' Concat (' | | V_end | | ', 0

Program Tip error:BadImageFormatException is raised when trying to load an Oracle client library. This problem occurs if you are running in 64-bit mode with the 32-bit Oracle client component installed.The scene appears:The VS2008 c/s application is

To view the usage of a tablespace:SelectA.tablespace_name,a.bytes/1024x768/1024x768"SumMB ", (a.bytes-B.bytes)/1024x768/1024x768"Used MB", b.bytes/1024x768/1024x768"Free MB",round(((A.bytes-B.bytes)/A.bytes)* -,2) "percent_used" from

Null value operation:NULL means null.First, the situation:1: Any field in the table can be a null value by default.2:not NULL indicates non-NULL, is a field with a constraint set to a non-null constraint, must have a valid value, and cannot be empty.

declare i number; temp_sum number; temp_hfmpcode temptable.pubname%type; --temptable.pubname%type指的是temptable表的pubname字段的类型 temp_fullname temptable.pubcode%type;begin select count(*) into temp_sum from temptable b; i := 1; while iThe above code can

1.oracle Database Creation User2.oracle Database setup Password3.oracle database grants permissions to users4. Specify table spaces5. Create a sequence6. Assigning Values to variables7. Query the number of tables by criteria8.Oracle Database

Delete tables: drop table name; field name: ALTER TABLE table name rename column name to new column name CREATE TABLE: Name of the CREATE TABLE table (field Name fields type, field name); Delete table data: TRUNCATE TABLE Extension Delete from table

Build Oracle Cascade DGNow DB and DG1 are a set of DG, on this basis to build a cascade reserve:Database version 11.2.0.4 Db_name=prod DB as the main library, DG1 for the standby library, DG2 for the Cascade Backup library;Db_unique_name

Transactions: Transactions are used to ensure consistency of data, which consists of a set of related DML statements that either succeed or fail all of the DML statements of the group.Description: A set of SQL, a logical unit of work, performing a

1. ORACLEBACKUP_EXPDP version|oracle.batThe file also needs to be changed manually as follows: The calling format needs to be changed to the call%~dp0\oraclebackup databaseUser namePasswordfolder name；2.Oracle Statement Create export path. txtThe

Oracle's MySQL repository encounters a pit summaryRecently in the project of Oracle to MySQL, the pit is really much, especially the storage process, has not touched the type of knowledge, and recently almost finished the summary. Hope to help some

First, Oracle's main file structure–Drive：\Oracle–Admin目录：日志文件–Ora90目录：程序文件–Oradata目录：数据库文件Second, the database startup and shutdown.1、至少启动两个服务： 数据库服务：OracleService”SID” 监听服务：Oracle”Oracle_home”TNSListener2、管理工具——服务3、CMD命令： Net start

The requirement is that the values stored in a field in a table are separated by commas, requiring that the data be traced against each of the separated values, but not using a like query.The data is this:The SQL for the query is as follows:SELECT *

Business Description: Grouped by T.truckid,t.riskcode, with fractions in each grouping, taking the record with the largest score in the group.Example: A1 B1 5 6A1 B1 5 3A1 B2 2 5A1 B2 2 1has been grouped by a-B but I need the first and third data,

Talk about how to do SQL audit for Oracle database: 1. How do you do a pre-grammar check? 首先要熟悉繁杂的oracle语法规范，并能提前报错（这不是问题）2. DDL statement column check, index check these are direct execution will be found, do you want to export the

Ways to start Scott users in Oracle 11GR2The method for starting Scott users in Oracle, in Oracle11gr2, (g for ' network ') database in which Scott was locked in the user's installation ,When you install Oracle, you can choose to unlock the user