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实际工作中经常碰到占比，比如XX部门超领金额占总金额的占比，离职人员占总人数占比等等。一直都是存取变量，计算结果。今天尝试了下结果集直接进行四则运算-- ============================================= --Author: --Create Date: --Description: -- ============================================= alter PROC [dbo].

1. The round () function is used in rounding. The first parameter is the data to be operated, and the second parameter is used to display the number of decimal places after rounding. 2.The numeric function has two parameters. The first parameter

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Tools:PostgreSQLOperating environment:Ubantu 14.0Data source:tpc-h DbgenTASK1:1. Download PostgreSQL (sudo install PostgreSQL), the results are as follows.TASK2:1. Follow the tutorial and go to the Dbgen folder to modify the makefile file. Then

--3.1 creating a Student Performance Management database (STUDSCORE_DB1) Create DATABASE STUDSCORE_DB1--DB creation statement --3.2 Create a Student performance management database (STUDSCORE_DB2), note the requirementsCreate DATABASE Studscore_db2

/* Ranking of increase/decrease */Copy codeThe Code is as follows:Select top 50 UserName, sum (ReceivePrice)-sum (GuessPrice) as ReceivePrice,Cast (sum (case when ReceivePrice> 0 THEN 1.0 ELSE 0 END)/count (ReceivePrice) * 100 as numeric () as

I sorted out several rankings for my website's World Cup conjecture activities. I spent half an hour writing SQL statements, but it is a pity that I have lost it here. It is a site of others and I don't feel bad. I sorted out several rankings for my

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/* Ranking of increase/decrease */ CopyCode The Code is as follows: Select top 50 username, sum (receiveprice)-sum (guessprice) as receiveprice, Cast (sum (case when receiveprice> 0 then 1.0 else 0 end)/count (receiveprice) * 100 as numeric () as

The 1.round () function is rounded with, the first parameter is the data we want to manipulate, the second parameter is set after we rounded the decimal point after a few shows.The 2 parameters of the 2.numeric function, the first representing the

When writing to half of the code, you need to count the product of the specified line. Think of a SQLNew function for EXP (SUM (field)) try. The full code is as follows-- ============================================= --Author: --Create Date:

Code--Isolate top Waitswith Waits as (SELECT wait_type, Wait_time_ms/ +. As wait_time_s, -. * Wait_time_ms/SUM (Wait_time_ms) over () as the PCT, Row_number () over (ORDER by Wait_time_ms DESC) as RN, -. * Signal_wait_time_ms/wait_time_ms

* * Increase in the decline of the ranking * Copy Code code as follows: Select top Username,sum (receiveprice)-sum (guessprice) as Receiveprice, Cast (sum (case when receiveprice>0 THEN 1.0 ELSE 0)/COUNT (receiveprice) * as numeric

In our OLAP implementation, SQL is extremely complex and uses a lot of temporary tables. During the installation of tempdb, the local disk path for SQL Server installation is selected by default, and no disk array is used. When learning PostgreSQL,

Declare @ datestart datetime, @ dateend datetime, @ date datetime select @ date = getdate () -- select @ datestart = cast (floor (cast (@ date as numeric () + 1-day (@ date) as datetime) at the beginning of a month) -- end of a month select @

?First, consistencyConsistency includes not NULL, unique, checkA) NOT NULLName varchar (NOT NULL)b) UniqueIf A1, A2 ... And so make up the candidate key, you can use unique (A1, A2 ...) To guarantee their uniqueness, but these fields can still be

There are no DECLARE @ execsqlNVARCHAR (1024) SET @ execsqlNSELECTCAST (+ CAST (125.365412354 ASNVARCHAR (20) + NASNUMERIC (20, + STR (10-CEILING (LOG10 (125.365412354) + N) EXECSP_EXECUTESQL @ execsql * ROUND? (? Nu SQL rounding up the ten valid

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Data | The data type SQL92 standard defines several basic data types, which are the basis for various data types in the SQL database. In the article "string data type", we have discussed in detail the string data types defined by the SQL92 standard.