avg or norton

;=80 then ' excellent ' when 中文版 >=60 then ' good ' Else ' bad ' end from Score-----------------------------------------------------SELECT *, case when english>=60 and math >=60 Then ' pass ' Else ' fail ' 3, If...elesIF (conditional expression) BEGIN--equivalent to { statement 1 in C # ... END--equivalent to the}else BEGIN statement in C # 1 ... end--calculates the average score and outputs, if the average score exceeds the score of the three students

Oracle Notes (eight) complex queries and summariesOne, complex query1. List all department numbers and names of at least one employee and count the average wage, minimum wage and maximum wage of these departments.1. Determine the required data sheet: EMP Table: Can find out the number of employees; Dept Table: Department name; EMP Table: Statistical information; 2. Determine the known associated fields: Emp.deptno=dept.deptno; The first step: Find out the depa

business scenarios where data accuracy is required, such as banks, compared to the fload/double type. Installation:这两个数据类型需要在数据库初始化以后，通过命令加载到需要的数据库中：[emailprotected]:~$ source deepgreendb/greenplum_path.sh[emailprotected]:~$ cd $GPHOME/share/postgresql/contrib/[emailprotected]:~/deepgreendb/share/postgresql/contrib$ psql postgres -f pg_decimal.sqlTest a piece:Use statement: Select AVG (x), sum (2*x) from table data Volume: 1 million [emailprotected]:

Optimization of the number of table scans has recently encountered some SQL optimization problems during interviews and study. The following is a summary of the following: information about employees whose salaries are higher than the average salary: For this question, the first query statement we wrote was: select * from e where sal> (select avg (sal) from e, the execution plan is as follows: [SQL] [SQL] create table e as select * from emp; [SQL] SQL

scanning 'Employee' table... Table: 'employe' (1195151303); index ID: 1, database ID: 53 TABLE level scan completed MED. -Pages Scanned ...... -Extents Scanned... -Extent Switches... -Avg. Pages per Extent... -Scan Density [Best Count: Actual Count] ......: 92.00% [] -Logical Scan Fragmentation ......: 0.56% -Extent Scan Fragmentation ..........: 12.50% -Avg. Bytes Free per Page ......: 552.3 -

, memory, and CPU, Select one of the servers asDatabase ServerWe need to test the performance of each server before. You also need to set some hardware parameters, such as setting disk controller parameters. For more information, see the difference between Writeback and Writethrough. So how to test it? How can we get the test indicators? You can refer to this article: SQL Server Database Engine Performance Tuning Basics Body As the market share of SQL Server grows over time, more and more SQL

the vro address, while the Standby Router is idle. While GLBP provides virtual routers, all the routers in the GLBP group can forward some data streams and participate in load balancing. It can be seen that GLBP can fully utilize network resources without excessive configuration and management. Active virtual gateway election The election of active virtual gateways uses an election mechanism similar to HRSP to elect active gateways. The routers with the highest priority become Active Routers. I

index of the table, which is time-consuming and can only be performed as needed. You can useDBCC showcontigTo determine whether to reconstruct the index of the table. DBCC showcontig('Table Name'); Take a test table as an example to output the results; -Pages scanned .................................... 197214-Extents scanned...　　-Extent switches DBCC ......　　-Avg. pages per exten ..........: 8.0　　-Scan densitybest coun ......: 99.97% [2465

page itself. To overcome the negative impact of data blocks, you need to reconstruct the index of the table, which is time-consuming and can only be performed as needed.You can useDBCC showcontigTo determine whether to reconstruct the index of the table. 2.DBCC showcontigUsage The following is an example. DBCC showcontig And DBCC redbindex . To ApplicationProgramMedium Of Employee Data Table As An Example , In SQL Server Of Query Analyzer Enter the following command: Use da

official Windows system. Download link: Http://www.microsoft.com/security_essentials/ (2) Avast Avast is a well-known computer security software that can defend against viruses, spyware and other security threats. Last month, Vince Steckler, CEO of avast, said avast had already exceeded 0.13 billion of software users.We can see the popularity of avast. In terms of product operation, avast adopts the so-called "Free value-added" (freemium) model, that is, users can use avast's common a

can be said that there may be two or three or more subqueries, and a good method is required. 2. Grouping query in SQL (usually used together with Aggregate functions ): Student Information table: Question: 1. query the average score of each grade and class; The average score of the query in article 2 is greater than 580. 1 solution: Select grade, AVG (total score) as "average score" From student information table Group by grade Illustration:

t_avg> top10_time_avg.log A log statistics file, you will see: www.2cto.com Report for slow logs:/var/log/mysql-slow.log slow query log file analyzed 40 queries total, 12 unique 40 queries; in addition to the repeat, there are 12 Sorted queries by 't_ avg' Sorted by average query Time Grand Totals: Time 4 s, Lock 0 s, Rows sent 236, rows Examined 8.63k ______________________________________________________________ 001 ___ Count: 1 (2.50%) This SQL ap

.) Ignored errors: 0 (0.00 per sec .) Reconnects: 0 (0.00 per sec .) General statistics: Total time: 12.8496 s Total number of events: 825 Total time taken by event execution: 399.6003 s Response time: Min: 1.01 ms Avg: 484.36 ms Max: 12602.74 ms Approx. 95 percentile: 222.79 ms Threads fairness: Events (avg/stddev): 25.7812/24.12 Execution time (avg