Oracle

Declarev_x Number; V_y Number; V_geo Clob; cursorCur is Selectc_x, C_y fromT_map_datawhereC_type= 'STREET' andc_object_id= '6fabc5ef8f9d4050950a775cdc86dc47' Order byc_id;beginV_geo:= 'POLYGON (('; OpenCur--Open Cursor Fetchcur

The NVL () function is a function in Oracle/plpgsql in the form of: NVL (string1, Replace_with)Function: If the string1 bit is null, then the NVL () function returns the value of Replace_with, otherwise the value of STING1 is returned.Note: Sting1

To try to write some suggested triggers for the job, here's an example.To create a trigger named Trg_fin_opb_accountcardCreate or Replace trigger Trg_fin_opb_accountcardBefore insert on Fin_opb_accountcardFor each rowBeginIf:new.card_no = 0

The following astriddesmet are translated from the Oracle DBA official documentation, which is also noted in the gaps.Managing Redo Log FilesLearning Goals:1. Explaining the purpose of redo log files2. Describe the structure of the redo log file3.

First log in to Sqlplus with system and password, and then:1. Log in to Oracle with SYSConnect sys/password as SYSDBA; (Can I log in to sqlplus directly with SYS?) ）2. Start to modify the codeShutdown immediate; Stop Oracle services and listen. If

Oracle Guaranteed Read Consistency principle  1:undo segment concept                   When the database is being modified, You need to save the data saved to the previous old to a place, and then modify the segment that is used to save the older

Transferred from: http://blog.sina.com.cn/s/blog_5f0e9ca50101iss6.htmlAfter Oracle is installed, there is a default database in which we can create our own database, in addition to the default database.For beginners, to avoid trouble, you can create

Syntax:InStr (Fatherstr, Sonstr [, Start_position [, Matchtimes]])FATHERSTR: Parent String. The position of the substring to look for in this string.SONSTR: The string to find in Fatherstr.Start_position: Represents the starting position from which

Javapublic boolean isnumeric (String str) { Pattern pattern = pattern.compile ("^-?[ 0-9]+\\.? [0-9]* "); Matcher isnum = Pattern.matcher (str); if (!isnum.matches ()) { return false; } return true; }Pythondef isnum (value):

In addition to full-library copies, this should be the fastest way to migrate data between Oracle's two databases.CREATE public DATABASE LINK Zhengshi CONNECT to username identified by "password" USING ' (DESCRIPTION =(Address_list =(ADDRESS =

Create Dbms_jobUse the following statement:? 12345678910 VARIABLE jobno number;begin  DBMS_JOB.SUBMIT(    :jobno, --job号，ORACLE自动分配    ‘your_procedure;‘,  --执行的存储过程或SQL语句,‘;‘不能省略    next_date, --下次执行时间    ‘interval‘--每次间隔时间，以天为单位  );

Sometimes you need to manipulate some tables in bulk, such as authorization, emptying data, and so on. You can do this using the concatenation of SQL statements.For example, you need to have all the tables in one user, grant the query permission to

Disabling Foreign keys for all tables for batch SQL statement execution in Oracle During database migration and data import, the existence of foreign key constraints between tables causes frequent insert errors. Batch execution of SQL statements is

SQL statement for Oracle user password validity period, oraclesql If you don't talk much about it, you can write SQL statements directly. Of course, there are many other ways to write SQL statements. I just want to share with you a solution. If you

How to Set Login. SQL in Oracle SqlPlus: sqlpluslogin. SQL Sqlplus automatically runs two scripts at startup: glogin. SQL and login. SQL. The execution order is 1. The glogin. SQL file is searched for and executed in the $ ORACLE_HOME/sqlplus/admin

Ksvcreate: Process (m000) creation failed, ksvcreatem000 A test Server Database (Oracle Database 10g Release 10.2.0.5.0-64bit Production) Suddenly fails to access. Check that the Database is in hang mode, check the alarm log, and find "ksvcreate:

Oracle hint, oraclehint 1. use_concat Online statement: The CONCATENATION and UNION/union all operations are similar. According to the OR query condition, a query is divided into two OR more parts, and the duplicate records are removed. Since the

Oracle: RETURNING clause, oraclereturning RETURNING is usually used in combination with DML statements. (Insert update delete) Usage: UPDATE table_name SET expr1RETURNING column_nameINTO xxx INSERT: returns the added value.UPDATE: return the updated

ORACLE-020: ORACLE tip 002 batch operation table Sometimes you need to operate tables in batches, such as authorization and data clearing. You can use concatenated SQL statements. For example, to grant the query permission to all tables of one

PL/SQL programming for ORACLE learning-local dynamic SQL and local oracle dynamicDirectory Note and overview before reading Introduction to dynamic SQL Use the excute immediate statement Process multi-row queries Use batch binding in dynamic