oracle sql practice exercises

Oracle Practice Exercises 1.0February 10, 2017 Friday 9:07:221, list the IT industry database types and user distribution2. List some products commonly used by Oracle Company3. Brief description of Oracle database software, databases, instances, and their presence4, through

Tags: use commit when date correct other Oracle new userDefined by the user himself1, define the exception name, type exception2, cite the exception (raise Excepttion)3. Catching exceptions Sql> Declare 2E_user_err exception; 3V_deptno Dept.deptno%Type:= No; 4 begin 5 UpdateDeptSetLoc='HongKong' whereDeptno=V_deptno; 6 7 ifSql%NotFound Then 8raise E_user_err; 9 End if; Ten

Define Name 2 at creation time, can be saved by Oracle Server 3, can be called by any program 4, can be sharedStored procedures:1. Stored Procedures without parameters:Sql> Create or Replace procedureProc1 is 2 3V_ename Emp.ename%type; 4V_sal Emp.sal%type; 5 6 begin 7 SelectEname,sal intoV_ename,v_sal fromEmpwhereEmpno=No; 8Dbms_output.put_line ('Name is:'||V_ename||' , '||'Salary is:'||v_sal); 9ExceptionTen whenNo_data_found

partition.The Order_by_clause sort statement must be required, as ordered by xxx Desc/asc Explanation Example:Sql> select * from Test_value;Mons JJR CJL Cjje---------- ---------- ---------- ----------200801 LZF 250 1999200802 LZF 200 2000200803 LZF 300 1000200804 LZF 23 189200805 LZF 356 456200806 LZF 100 200200807 LZF 600 700200808 LZF 23 123200809 LZF 400 500 9 Rows selectedSql>Sql> Select rownum serial number, MONS,CJL cjl_01,2 Leads (cjl,1) over

partition.The Order_by_clause sort statement must be required, as ordered by xxx Desc/asc Explanation Example:Sql> select * from Test_value;Mons JJR CJL Cjje---------- ---------- ---------- ----------200801 LZF 250 1999200802 LZF 200 2000200803 LZF 300 1000200804 LZF 23 189200805 LZF 356 456200806 LZF 100 200200807 LZF 600 700200808 LZF 23 123200809 LZF 400 5009 Rows selectedSql>Sql> Select rownum serial number, MONS,CJL cjl_01,2 Leads (cjl,1) over

relational data systems in the world, covering dozens of models, including large, medium and small machines.Oracle database products have the following excellent features.(1) CompatibilityOracle products are standard SQL and tested by the U.S. National Institute of Standards and Technology (NIST). Compatible with IBM Sql/ds, DB2, INGRES, IDMS/R, and more.(2) PortabilityOracle's products can run on a wide r

From the composition of the SGA of Oracle, it is highly recommended to use parameter bindings. Using parameter bindings makes it possible to use the share Pool efficiently, which can significantly improve performance by not having to harden the cached SQL. The specific practice is as follows: Sql>create table Test (a

Tags: codec encountered shell encoding range timeout 1.7 Sch Search-Type injection netProgram IntroductionThe Super SQL Injection tool (ssqlinjection) is an HTTP protocol-based self-package SQL injection tool that supports SQL injection anywhere in the HTTP protocol, supports various types of SQL injection, and support

Oracle trigger practice (ADD, modify, delete) to monitor the addition, modification, and deletion of a table, and record it to another table... the specific code is as follows: SQL code create or replace trigger test_trigger before insert or update or delete on test_table for each row declare v_id varchar2 (30); v_bdlb varchar2 (1 ); v_jtpd VARCHAR2 (12); v_jgmc

processing is intended to return the result set, Besides, I've already got the table A. field A, the final correct data is based on this field A to obtain, as long as it is not with the other two tables do not match the data can be the equivalent of organizing the wardrobe, the useless clothes out of this process. And the field a,b,c,d is the primary key of each table, there is no concept of NULL value, there is no need for additional judgment. So the last not-in is 3 seconds faster than not ex

Today, I am working on an OA report. I use a stored procedure to calculate some data. When doing a for xxx in xxxx loop end loop; loop, I never knew it was Mao. I can't catch the no_data_found exception in for any more. Once this no_data_found Oracle occurs, it automatically jumps out of the for loop, but I don't know what went wrong, that was depressing for an hour. Shit. Later I remembered that pl/SQL too

WHERE Grade = ' A ' ); A correlated subquery:--> related subqueries SELECT * From STUDENT WHERE 0 (SELECT count (*) From registration WHERE Grade = ' A ' and student_id = student.student_id ); We should optimize the current SQL statements according to the basic SQL principles. 5, writing efficient SQL statem

Oracle-based SQL Optimization MethodologyThe ultimate goal of SQL Optimization in Oracle databases is to shorten the execution time of target SQL statements. To achieve the above purpose, we usually have the following three methods to choose from:1. Reduce the resource consu

Oracle cold, stay at home and read the "Mastering Oracle SQL" 2nd, found that Oracle's function is still very strong, there are 200 optical functions, hsql is difficult to match. The next stubborn, it seems either to risk using Hibernate3.0 SQL mapping function, or to run the JDBC assembly VO. 1. Report Totals dedicate

Oracle SQL Performance 1. ORACLE optimizer:. RULE (based on Rules) B. COST (COST-based) c. CHOOSE (optional) sets the default optimizer. various declarations of the OPTIMIZER_MODE parameter in the ora file, such as RULE, COST, CHOOSE, ALL_ROWS, FIRST_ROWS. of course, you also overwrite SQL statements or sessions. to us

, plus detailed information about the wait time. For each wait in the processing process, the following information is provided: the name, duration, and some additional parameters of the waiting time, indicating the resources to be waited12Both startup level 4 and Level 8Before Oracle 9i or, the following SQL statement activates an SQL trace for the session: ?

From: http://livenzhao.spaces.live.com/blog/cns! 6e0000be9f6ddd872! 595. entry· PL/SQL Developer skills 1. PL/SQL Developer remember the Login Password When PL/SQL Developer is used, PL/SQL Developer needs to remember the username and password for logging on to Oracle for

The best way to learn is practice! Therefore, my learning is based on practice. The most basic SQL statement is the query statement. The best way to learn is practice! Therefore, my learning is based on practice. The most basic SQL