sql oracle case statement in where clause

------------------------------------------------------------------------------------------------------------| Id | Operation | Name | Rows | Bytes | Cost (%CPU) | Time | Pstart| Pstop |------------------------------------------------------------------------------------------------------------| 0 | SELECT STATEMENT | | | | 68 (100) | | | || 1 | PARTITION LIST All | | 1 | 247 | 68 (0) | 00:00:01 | 1 | 2 || 2

. When the loop is first entered, the loop range is determined and will not be recalculated again. Once per cycle, the cycle index will automatically increase by 1.For ... The syntax structure of the loop statement is as follows:[] for inch []lower_bound. Upper_boundloopstatement ... END [label_name] ; "Syntax description" Index_name: Loop counter, is a variable that can get the current loop exponent. It is important to note that you cannot assign a

Tags: ora-00942After Oracle creates a new user, the client executes the SQL query with the following error message:Execute the query statement as follows:SELECT * from Sm_sales_order;ORA-00942: Table or view does not existCreate a new user and specify tablespace and temp table spaceCREATE USER xxx identified by xxxxDEFAULT tablespace LMSTemporary tablespace TEMP;

-------------100302070901105040801060Rows selectedSQL Statement and sql*plus command Structural Query LanguageSql?A language?ANSI Standard?Keywords cannot be abbreviated?Use statements to control the definition information of tables in a database and the data in a tableSql*plus?An environment?One of the features of Oracle?Keywords can be abbreviated Desc EMPL

One: An optimization approach to SQL statements1. Select the appropriate Oracle Optimizer(1). RBO optimization based on rules --oracle 10G was thrown away(2). CBO optimized optimizer based on cost (CPU and memory occupancy) - The model used by the optimizer depends on the targetThe CBO optimization mode:Rule: Rules-basedChoose: Default, table or index has statist

Label:1. Order of execution:Client input SQL statementSQL statements reach the DB instance over the networkAfter the server porcess receives the SQL statementA. Parse the SQL statement into an execution plan before executingB, parsing: Consume a lot of resources: CPU, IO, if there is a cache in the shared pool does not

When diagnosing a performance problem with SQL, we sometimes need to get the actual value of its bound variable, and then bring the actual value into the SQL statement, make a SELECT statement with the original SQL (with the Where condition), actually execute it, and see wha

Tags: using ar sp data div art on BS sizePaged query statements that are used in different databases:Current page: CurrentPagePage Size: pagesize1. Oracle DatabaseSELECT * FROM (select A.*,rownum rn from (query_sql) A) where Rn Note: query_sql is a query SQL statement.OrSELECT * FROM (select RowNum rn,id from TABLENAME where RowNum 2. Infomix DatabaseSelect Skip CurrentPage First pagesize * from TABLENAME3.

count (ename) >=2; Order by Sort:select * from emp order BY Sal Desc; subquery: Query for employees with base pay greater than average salary: SELECT * from emp where sal> (select AVG (SAL) from EMP) Federated query: and set (to repeat): Select * from T_user1 Union Select * from T_user2; and set: Select * from T_user1 Union All Select * from T_user2; Intersection: Select * from T_user1 intersect Select * from T_user2; Subtraction Select * from t_user1 minus select* from t_user2; I

The original statement is this: Select SUM (sl0000) from XSTFXPS2 where Dhao00 in ( Select dhao00 from Xstfxps1 where Trunc (ywrq00) =trunc (sysdate) and khdm00= ' 500000003913 '); Time used: 00:02:49.04 　　 Execution Plan ---------------------------------------------------------- 0 SELECT STATEMENT Optimizer=choose 1 0 SORT (AGGREGATE) 2 1 NESTED LOOPS 3 2 TABLE ACCESS (full) ' XSTFXPS2 ' 4 2 TABLE ACCES

Nonsense not to say, directly to everyone to write SQL statements, of course, there are many kinds of writing, I also just to share one of the solutions, have different views of the can leave a message oh. Oracle's password is valid for a period of validity, and sometimes you will see a statement that the current password expires: SELECT * from Dba_profiles s WHERE s.profile= ' DEFAULT ' and resource_

Tags: sql OracleUpdating a field is simple and easy to understand: Update TableA A SET a.name= (select name from TableB B where a.id=b.id) is more verbose when updating multiple fields: UPDATE TableA A SET a.name= (select name from TableB b where a.id=b.id), a.age= (select age from TableB b where a.id=b.id) If you need to update too many fields, so the write is too messy, and the efficiency of duplicate query is also greatly reduced, you can use t

Label:1.Oracle string concatenationOracle supports string concatenation with the concat () function and automatically converts other types to strings except for "| |", but unlike MySQL's concat () function, Oracle's CONCAT () function supports only two parameter stitching.If more than one parameter needs to be nested using multiple CONCAT () functions, as shown in the following sql: SELECT CONCAT (CONCAT (

Enter Sqlplus Sql> Set Timing on Sql> Sql> Select COUNT (*) from Comm_human_role; COUNT (*) ---------- 866 elapsed:00:00:00.05 The above digital output is: Hours:Minutes:Seconds.Milliseconds It takes 0.05 seconds to execute, equivalent to 50 milliseconds. Time if this is the expression: 00:03:235.78 The total time is 235.78 seconds, less than 4 minutes, so the di

displayed. This field can only use less than or less than or equal, cannot use greater than or greater than equals.If pagination can only be queried first rownum this column select RowNum from EMP, and then from here rownum> or Select RowNum, ename from (select RowNum No from emp) T where no>3 and no--The 6th to 10th employee of the highest salarySelect Ename,sal from (select Ename,sal,rownum r from (select Ename,sal from emp order by sal Desc)) where r>=6 and r lt;=10;--For the last 5 employee