oracle database sql expert certification

Oracle Database Programming: PL/SQL programming basics Oracle Database Programming: basic concepts of Oracle databases http://www.bkjia.com/database/201307/226254.html 2. PL/

Files (x86) \instantclient-basic-win32-10.2.0.5\instantclient_10_2 OCI Library filled in: C:\Program Files (x86) \instantclient-basic-win32-10.2.0.5\instantclient_10_2\oci.dll then apply, Login4, the login page in the "Database"option, enter TNS in theIP: Port/DB instance (tested, this must be written here, otherwise not properly connected)Report:Plsql Developer V9.0.2.1621 Registration codePassword:xs374ca Product code:46lexxzpthqrjmkhyd5czddfcjh3

PL/SQLPL/SQL is a block-structured language that places a set of statements in a block and sends it to the server at once. It is an extended language combined with Oracle process language and Structured Query languageComposition of PL/SQL code blocksDeclare--The markup declaration section is used to declare some variables before beginBegin-A sign of the beginning

Oracle Database Table Structure and data export SQL statement can Oracle database table structure and data be exported as SQL statements? ------ Solution ---------------------------------------------------------- 1.exp username/pa

Technorati label: before creating a table in PL/SQL, determine whether the table exists. Delete the execution statement of the table if any. Since PL/SQL is used for Oracle client operations, since SQL 2005 was used to execute "before creating a table, determine whether the table exists. If yes, delete the table, the

2000 of these two numbers, you can write:SELECT * from the users where salary not between and 2000; (2) In/not in SELECT * from the users where username in (' AAA ', ' BBB ');SELECT * from the users where username not in (' AAA ', ' BBB ');? 9. Sort the results of the querySyntax: SELECT [DISTINCT] column_name1,... | * FROM table_name [WHERE conditions] ORDER by column_name1 desc| Asc...Where Desc is sorted in descending order, ASC is ascending sort, by default is ascending sort ? 10. Case...w

Connect to the sqlserver database: String albumname = textboxname. text. trim (); // obtain the new album name sqlconnection conn = new sqlconnection ("Server = (local); database = Electronic album; uid = sa; Pwd = zouming "); // connect to the database Conn. open (); string SQL = "insert into table_name (name) values

= ' Cmdb_hlj '; Query Cmdb_hlj This database is connected to the sid,serial# Alter system kill session ' 54,5 '; Kill connection ' Sid,serial ' Alter system kill session ' 98,select * from sys.dba_tablespaces;23 '; Kill connection ' Sid,serial ' Alter system kill session ' 137,3 '; Kill connection ' Sid,serial ' DROP USER CMDB_HLJ Cascade; Delete User 9.--View table space namesSELECT * from Sys.dba_tablespaces;10.--e

Tags: exec SQL sql_id execute disk ESC ONS view ORDER BY1. View the top 10 SQL statements with the most total consumed time SELECT * FROM (select v.sql_id, V.child_number, V.sql_text, V.elapsed_time, V.cpu_time, V.disk_reads, Rank () Over (o Rder by v.elapsed_time Desc) Elapsed_rank from V$sql v) a where Elapsed_rank 2. View the top 10

. (2) The difference between nvarchar and nvarchar2 is the same as the above. The difference is the type defined according to the Unicode standard. It is usually used to support the definition of similar systems in multiple languages. 1. the length of char is fixed. For example, if you define char (20), even if you insert abc, less than 20 bytes, the database will also automatically add 17 spaces after abc to Supplement 20 bytes. char is differentiate

Page Size *From table1where id>(select Max (ID) from(Select Top ((page 1) * page size) ID from table1 ORDER by ID) as T)ORDER BY IDHow much of this method does not always have a big drop, the stamina is still very sufficient. Especially when the data volume is large, the execution speed of the method is not reduced at all.Using top requires that the primary key must be unique and cannot be a federated primary key. If it is a federated primary key, the query results are out of order.Currently, S

example: SELECT/*+full (BSEMPMS) Cahe (BSEMPMS) * * Emp_nam from Bsempms; /*+nocache (TABLE) * * When a full table scan is performed, the cache hint can place the retrieved block of the table in the buffer cache with the most recent LRU of the least list For example: SELECT/*+full (BSEMPMS) Nocahe (BSEMPMS) * * Emp_nam from Bsempms; /*+append*/. You can increase the speed by inserting it directly into the end of the table. Insert/*+append*/into test1 select

1) Overview: the programming language formed after procedural expansion of Oracle in the standard SQL language is a unique Oracle language that supports application development. 2) Syntax: 1. basic Structure declare -- declare some variables, constants, user-defined data types, cursors, and so on -- this part is optional. If you do not need to write begin, the ma

row positioner is a pointer to a row. For clustered tables, the row locator is the clustered index key. In SQL Server 2005, you can add non-key columns to the leaf level of a non-clustered index to skip the existing index key limit (900 bytes and 16 key columns ), perform index queries within the full range. Non-clustered indexes and clustered indexes share the same B-tree structure. The significant difference between them lies in the following two p

First, the problem descriptionThe oracle-client side is not installed locally, and because of limited machine resources, you want to connect to the remote database via PL/SQL developer. Simple installation PL/SQL developer cannot connect to the database remotely.Second, the

PL/SQL Developer does not install a client to connect to a remote oracle database (for example, developeroracle)Labels ):Http://www.oracle.com/technetwork/cn/database/features/instant-client/index-092699-zhs.html2. Download and install PLSQL (around 16 Mb ):Http://www.onlinedown.net/soft/4902.htm3. Unzip the instantcli

' (DESCRIPTION = 10.24. 101.105 1521 ) = dg4msql)) (HS = OK)) ' 7. Query validation Select from [Email protected] Main points of Discovery: 1. Initdg4msql.ora must be a directory: C:\app\tg\Administrator\product\12.2. 0\tghome_1\dg4msql\admin and must follow the format. This link can be changed casually, do not need to restart Lsnrctl. Re-create Dblink Auto refresh should be a walk once disk IO 2. The network in the DG directory must exist, and there is a static reg

We know that any programming language can handle exceptions, such as Java and C ++.Oracle DatabaseHow to handle exceptions? In fact, the handling of Oracle Database exceptions is actually very simple. This article givesPL/SQL Exception HandlingThe Code is as follows: declare e_1exception; begin b

Oracle Query result set, random sort Copy Code code as follows: SELECT * FROM table1 ORDER by Dbms_random.value (); MySQL randomly query out a record: Copy Code code as follows: --The following query statement is efficient, do not use SELECT * FROM table1 to rand () LIMIT to query select * FROM table1 WHERE id= (select IDs from table1 O Rder by Rand () LIMIT 1) Query result set, random sort Copy Code code as follows:

Label:zyl910I. DescriptionThis tool is suitable for use in the following situations-* Quickly view data and table structure information in the database.* Test the wording of the connection string under ADO.* Help analyze the ADO database operation.Second, usageRun this program.Select the data provider factory in the Provider drop-down box. (if not, try adding the data provider factory configuration to the Z