Oracle

Related CodeAs follows: 1. Create sequence: Copy codeThe Code is as follows: Create sequence sequ_data_datainfo increment by 1 start with 1 nocycle nocache noorder; 2. Create a trigger: Copy codeThe Code is as follows: Create or replace

1. Start-> Run. Enter services. MSC to the service and stop all Oracle services; 2. Start-> Program -> Oracle-orahome81-> Oracle Installation products-> universal Installer: Uninstall all Oracle products, but the universal installer itself cannot

First, let's take a look at SQL Server. Previously, we used the foreground to select a start time and an end time (in the smallest unit of day), and then used it as a condition for query, if we use "between starttime and endtime" as the condition,

If you use the order by sorting statement to specify the order by employee number, all records generated after sorting are temporary data. How does the Oracle database process the temporary data? Generally, the Oracle database first stores the

I believe that three appropriate indexes should be created, that is, the appropriate number of indexes should be created on the appropriate tables and columns. Although this can be summarized in one sentence, the database administrator must make

I. Introduction Super Large systems have the following features: 1. Generally, the number of users processed exceeds 1 million, and the number of users processed exceeds 10 million. The data volume of the database generally exceeds 1 TB; 2. The

Create or replace procedure proc6338196642095312503719 (enter the news topic varchar2, enter the news content varchar2, enter the publishing time varchar2, enter the current page number, enter the number of lines per page, and output the current

First, exp unload the data to the file system to generate. DMP file, and then the data is loaded into the database by IMP when necessary. for small and medium databases, the DMP file generated by the full database exp may be less than 2 GB, but for

The principle is to declare constants, including the number of columns, number of rows, and attributes of each column, and then Program Other processes use these constants to control cells. Very convenient for modification and transplantation! The

1. Create a stored procedure Create or replace procedure Test (var_name_1 in type, var_name_2 out type)-- Declare a variable (variable name and variable type)Begin-- Execution body of the stored procedureEnd test;Print the input time informationE.

Oracle System Requirements Enterprise Edition: Minimum CPU Pentium 200 m recommended pentiumiii 1g or above Minimum Memory 128 M recommended 512 m Hard Disk Space System Disk 140 m mounting disk 4.5g (FAT32) or 2.75g (NTFs) Standard Edition: Minimum

1. Check which users are in the database? Select username from all_users; 2. Check which DBA users are in the database? Select username from dba_users; 3. view the tables owned by the current user? Select table_name from user_tables; 4.

1. Intersect is the intersection of multiple query results; 2. query the SQL statements recorded in the table within two basic periods; Select * From shengjibiao t where T. createtime between to_date ('2017-7-26 ', 'yyyy-mm-dd') and to_date ('2017-7-

Inner join ). External Connection: Full join, left join, and right join ). Cross join ). The outer join and the inner join are different. The query results returned by the outer join include not only the rows that meet the conditions, but also the

View the table space name and size Copy codeThe Code is as follows: SQL> select t. tablespace_name, round (sum (bytes/(1024*1024), 0) ts_size From dba_tablespaces t, dba_data_files d where t. tablespace_name = d. tablespace_name group by t.

Raise a code segment and ask for help. The code snippet is as follows: Copy codeThe Code is as follows: declare Type t_indexby is table of number Index by binary_integer; Type t_nesteed is table of number; Type t_varray is varray (10) of

1. Create a table Copy codeThe Code is as follows: -- Create table Create table test ( Dm1 char (3 ), Dm2 char (3 ), Mc1 nvarchar2 (20 ), Val nvarchar2 (20) ) 2. Fill in the following data: DM1 DM2 MC1 VAL 101

1. query Table Name: Copy codeThe Code is as follows: select table_name, tablespace_name, temporary from user_tables [where table_name = table name] Where: table_name: Table Name (varchar2 (30 ));Tablespace_name: The tablespace that stores the

Show parameter processes; Then Change System connections Alter system set processses = 1000 scope = spfile; The procedure and description are as follows: Problem description: an error is reported when the client connects to the database. ORA-12516:

Copy codeThe Code is as follows: select a. f_username From ( SELECT/* + parallel (gu, 4) */distinct gu. f_username FROM t_base_succprouser gu Where gu. f_expectenddate> (select trunc (sysdate, 'y') from dual) And gu. f_lotid = 1 And gu. f_playid = 4