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of 1250 NODE5, then the only node affected is the Node1,node1 storage range changed from [0, 2500] [0, 1250), NODE5 storage range is [1250, 2500), so it needs to be dropped on [1250, 2500) range of data moved to NODE5. It is very important that the others do not need to make changes. Equivalent to NODE5 share part of

) ---------- --------------------------------------------- 10 1 2 3 20 1 2 3 4 4 30 1 2 2 3 4 5 14 rows have been selected. Time used: 00:00:00.20 Sql> Select Deptno,ename,sal,lag (ename,1,null) over (partition by Deptno order by ename) from Emp Ord Er by deptno; DEPTNO ename SAL LAG (ename, ---------- ---------- ---------- ---------- Ten CLARK 2450 KING 5000 CLARK MILLER 1300 KING ADAMS 1100 FORD 3000 ADAMS JONES 2975 FORD SCOTT 3000 JONES. SMITH SCOTT ALLEN 1600 BLAKE 2850 ALLEN JAMES

Oracle in the database, null values are used to indicate a situation where the actual value is unknown or meaningless. In a table, if a column in a row has no value, it is called a null value (NULL). Columns of any data type can have null values if they do not use non-null (not NULL) or primary key (PRIMARY key) integrity restrictions. In practical application, if the existence of NULL value is ignored, it will cause unnecessary trouble. ----For example, in the following employee table (EMP), th

Employee SAMPLE (20); EMPNO ename JOB MGR hiredate SAL COMM DEPTNO----------------------------------------------------------------------- -------7654 MARTIN SalesmA 7698 28-sep-81 1250 1400 7844 TURNER salesman 7698 08-sep-81 1500 0 30Execution plan-------------------------------- --------------------------0 SELECT STATEMENT optimizer=choose (cost=2 card=16 bytes=1392) 1 0 TABLE ACCESS (SAMPLE) of ' E Mployee ' (cost=2 card=16 bytes=1392) Statistics-

supplier values (' S3 ', ' Zhenhua electronics factory ', ' Xian ');INSERT into supplier values (' S4 ', ' Hua-powered subsidiaries ', ' Beijing ');INSERT into supplier values (' S6 ', ' 607 factory ', ' Zhengzhou ');INSERT into supplier values (' S7 ', ' ai Hua Electronics Factory ', ' Beijing ');INSERT into staff values (' WH2 ', ' E1 ', 1220);INSERT into staff values (' WH1 ', ' E3 ', 1210);INSERT into staff values (' WH2 ', ' E4 ', 1250);INSERT i

Use the Linesize command to set the number of characters a row of data can hold, with a default number of 80. If the value of the linesize is smaller,Then a row of data in the table will need to be displayed on the screen, and if the value of Linesize is set larger, a row of data can beDisplayed in a row on the screen.The syntax of the Linesize command is as follows:Set Linesize nwhere n means that a row of data on the screen can beThe number of characters in Na, valid range is 1-32767.As shown

SMITH clerk 7902 17-dec-80 800 7499 ALLEN salesman 7698 20-feb-81 N Bsp 300 , 7521 WARD SAL Esman 7698 22-feb-81 1250 500 NB Sp 7566 JONES manager 7839 02-apr-81 N Bsp 2975 20 7654 MARTIN NBSP ; Salesman 7698 28-sep-81 1250 1400 NBSP ; 7698 BLAKE manager 7839 01-may-81 N Bsp 2850 30 7782 CLARK

---------- ---------- --------- ---------- --------- ---------- ---------- ---------- 7369 SMITH Clerk 7902 17-dec-80 20 7499 ALLEN salesman 7698 20-feb-81 30 7521 WARD salesman 7698 22-feb-81 1250 30 7566 JONES MANAGER 7839 02-apr-81 2975 20 7654 MARTIN salesman 7698 28-sep-81

; 7499 ALLEN salesman 7698 20-feb-81 1600 300 30 7521 WARD salesman 7698 22-feb-81 1250 500 N Bsp 30 7566 JONES manager 7839 02-apr-81 NB Sp 2975 nbsp 20 7654 MARTIN salesman N Bsp 7698 28-sep-81 1250 1400 30NBSP ; 7698 BLAKE manager 7839 01-may-81 2850 30 7782 CLARK NBSP ; MANAGER 7839 09-jun-81 2450 N

| | ') ';ifqYou can test the return value of this function in PL/SQL Developer:Begin Dbms_output.put_line (Test_query_func (')); end;Output Result:[(' 7499 ', ' ALLEN ', ' salesman ', ' a ') ', (' 7521 ', ' WARD ', ' salesman ', ' 1250 '), (' 7654 ', ' MARTIN ', ' salesman ', ' 1250 '), (' 7698 ', ' BLAKE ', ' MANAGER ', ' 2850 '), (' 7844 ', ' TURNER ', ' salesman ', ' the ') ', (' 7900 ', ' JAMES ', ' cl

'--------------------------------------------- ------------------- ---------Item No: 7369 Smith's salary is: 800 yuanItem No: 7499 Allen's salary is: 1600 yuanItem No: 7521 Ward's salary is: 1250 yuanItem No: 7566 Jones's salary is: 2975 yuanItem No: 7654 Martin's salary is: 1250 yuanItem No: 7698 Blake's salary is: 2850 yuanItem No: 7782 Clark's salary is: 2450 yuanItem No: 7788 Scott's salary is: 3000 yu

HireDate SAL COMM 7369 SMITH Clerk 7902 17-dec-80 800 7499 ALLEN Salesman 7698 20-feb-81 1600 300 7521 WARD Salesman 7698 22-feb-81 1250 500 7566 JONES MANAGER 7839 02-apr-81 2975 7654 MARTIN Salesman 7698 28-sep-81

Rowid:object ID (6), relative file ID (3), block ID (6), row ID (3) (1) Comparing the rowid of common table and cluster table Sql> select Rowid,ename,sal from Scott.emp; ROWID ename SAL ------------------ ---------- ---------- AAACYNAAEAAAAAEAAA SMITH 800 Aaacynaaeaaaaaeaab ALLEN 1600 AAACYNAAEAAAAAEAAC WARD 1250 Aaacynaaeaaaaaeaad JONES 2975 AAACYNAAEAAAAAEAAE MARTIN 1250 AAACYNAAEAAAAAEAAF BLAK

same name when you flash back to the table, you can specify a new table name on flashback:Sql> Flashback table EMP to before drop rename to Emp1;Flashback complete.2. misoperation Delete the EMP table Use the Flashback query results to recover as long as the undo table space is still in error before the operation time data.sql> Delete from EMP;Rows deleted.Sql> commit;Commit complete.Sql> select * from EMP;No rows selectedSql> SELECT * from emp as of timestamp to_timestamp (' 2015-03-13 1

, the following query: SELECT * from EMP E, dept d WHERE E.deptno=d.deptno; EMPNO ename JOB MGR hiredate SAL COMM DEPTNO DEPTNO dname LOC---------- ---------- --------- ---------- -------------- ---------- ---------- ---------- ---------7782 CLARK MANAGER 7839 September-June -81 2450 ACCOUNTING NEW YORK7839 KING President 1 July-November -81 ACCOUNTING NEW YORK7934 MILLER Clerk 7782 2 March-January -82 1300 ACCOUNTING NEW YORK7369 SMITH Clerk 7902 1 July-December -80 the DALLAS7876 ADAMS Clerk

$ $999 Returns a dollar sign at the beginning of a number Eeee 9.99EEEE Scientific notation means L L999 Add a local currency symbol to the number before PR 999PR If a numeric negative number is represented by angle brackets Code Demo: To_char Processing of numbersSelect To_char ( -123123.45, ' L9.9eeeepr ') "date" from dual;2, To_date (X,[,FMT])Converts a string into a date type in the FMT

Tags: oracle use pagesize commandwith the pagesize command, you can set the size of each page to control the amount of data displayed on each page. Syntax format of the pagesize commandAs follows:Set pagesize nWhere the parameter n represents a positive integer for each page size, the maximum value can be 50000, the default value is 14, the page is not just the output dataComposition, 20 by sql*plus like is to the screen of all output results constitute, including the title and Blank lines.For e

() function, handling nullExample: asking for a full annual salary for each employeeSELECT Ename,sal,comm, (sal+comm) *12 from EMP;Sql> SELECT Ename,sal,comm, (sal+comm) *12 from EMP; ename SAL COMM (sal+comm) *12-------------------------------------------SMITH 800ALLEN 22800WARD 1250 21000JONES 2975MARTIN 1250 1400

() over (partition by deptno order by sal) from emp order by deptno; DEPTNO DENSE_RANK () OVER (PARTITIONBYDEPTNOORDERBYSAL) ------------------------------------------------------- 10 1 2 3 20 1 2 3 4 4 30 1 2 2 3 4 5 14 rows have been selected. Used time: 00: 00: 00.20 SQL> select deptno, ename, sal, lag (ename, 1, null) over (partition by deptno order by ename) from emp ord Er by deptno; Deptno ename sal lag (ENAME, ---------------------------------------- 10 CLARK 2450 KING 5000 CLARK

Example of using the over function in Oracle Sum (sal) over (partition by deptno order by ename) Department continuous sum, -- the salary of each department "continuous" sum, Environment: windows 2000 server + Oracle8.1.7 + SQL * plus Objective: To use the scott model provided by oracle as the testing environment and analyze the usage of functions through testing. Usage similar to sum (...) over... 1. Original table information: SQL> break on deptno skip 1 -- display the data segments of differe