oracle cloud tables

There is a new feature in Oracle 11g R2. When the table has no data, no segment is allocated to save space. Oracle cannot export empty tables when executing export, but there are still solutions: Solution: 1. insert a row and then roll back to generate a segment. This method inserts data into an empty table and then deletes it, resulting in a segment. An empty

Tags: tab ant copy allows Pat WSM password data export enabled In the actual project development often encountered in the import and export of the Oracle database table, the following are some common cmd commands: First, the export of the data table 1 full export of database test, user Name System Password Manager exported to D:daochu.dmp Exp file=d:daochu.dmp full=y or (exp rrs/[email protected] file=daochu.dmp full=y) This is to export the table all

Oracle Table Complex Queryin practical applications often need to perform complex data statistics, often need to display more than one table of data, now we show you a more complex SELECT statementData Grouping -max,min,avg,sum,countHow to show the highest wage and minimum wage for all employeesSql>select Max (SAL) "Maximum wage", min (sal) "minimum wage" from EMP;Please inquire about the highest annual salarySql>select Max (SAL*13+NVL (comm,0) *13) "

OracleFaq (how to change the column name and sequence of tables in ORACLE ). If you need to reprint it, please indicate the source! Anyone who has used ORACLE knows that it is very cumbersome to change the column name and sequence of tables in ORACLE. here is a simple method

Oracle does not distinguish whether tables or indexes are stored in tablespaces. When the data volume is small, you can place tables and indexes in the same tablespace, but as the data volume increases Oracle does not distinguish whether tables or indexes are stored in table

' Exp username/[email protected] tables= ' | | table_name| | ' File= ' | | table_name| | '. DMP Triggers=n ' from User_tables; Spool off; Set feedback on; Set pagesize 9999; Set heading on; Set verify on; When exit is complete, the. bat file is found in the C: \ database, the batch file is edited, the first and last lines are deleted, and all the tables under that user are exported after saving the batch f

CREATEGLOBALTEMPORARYTABLETABLENAME (COL1VARCHAR2 (10), COL2NUMBER) ONCOMMITPRESERVE (DELETE) ROWS; -- O Create global temporary table tablename (COL1 VARCHAR2 (10), COL2 NUMBER) on commit preserve (DELETE) ROWS; -- O Create global temporary table tablename (COL1 VARCHAR2 (10 ),COL2 NUMBER) On commit preserve (DELETE) ROWS; -- On commit delete rows indicates that the temporary table is specified by a transaction. After each COMMIT, Oracle truncat

View All Tables and fields and Table comments. Field comments in Oracle View All Tables and fields and Table comments. Field comments in Oracle Get table: Select table_name from user_tables; // The table owned by the current userSelect table_name from all_tables; // tables o

How to use Oracle External tables to import text file data Recently, colleagues are busy with Data Consistency comparison. They need to compare the data in different text files. Some files are large and have many records. If they are opened in a common text editor, it is obvious that, it will be very difficult, or even cannot be opened. Based on this, you can import the data of the text file to the databa

A friend mentioned a data pump import problem, in the presence of a table, do not delete the table, and import the table's data and indexes. In fact, this task is very simple for imp, because IMP works in this way. sql> CREATE TABLE T_exp 2 (ID number, NAME VARCHAR2 (30)); Table has been created. sql> CREATE INDEX ind_t_exp_id 2 on T_exp (ID); The index has been created. Sql> INSERT into T_exp 2 SELECT rownum, Tname 3 from TAB; 72 lines have been created. Sql> COMMIT; Submit complet

First, you must understand that the physical structure of the database is determined by the operating system files of the database. Each Oracle database consists of three types of files: data files, log files, and control files. Database files provide real physical storage for database information. Each Oracle database has one or more physical data files ). A database data file contains all the database dat