as numeric

Always keep decimals, calculation in the program is too cumbersome, but also to convert the operation. It is convenient to operate directly in the database.The data type is defined as Decimal/numeric type, the decimal place needs to be arbitrarily

PostgreSQL type ConversionLike Oracle, PostgreSQL also has a powerful type conversion function, with just two types of conversion examples below.--1 Examplepostgres=# Select 1/4;? column?----------0(1 row)In PG If you want to divide and want to keep

Both cast and convert in SQL Server convert an expression from one data type to another data type. Because SQL Server provides two features, it can be confusing to choose which feature should be chosen or in which case the feature should be used.

--Contract Execution degree (cumulative approved/Contract summary amount)-Investment Progress (total contract sum/approved estimate investment)Select A.*,cast (Round (ljysp/(case is xmze=0 then 1 else Xmze end) *100,2) as numeric (5,2)) as Htzxd,

Reprint Please specify: theviper http://www.cnblogs.com/TheViperVariables, objects, and referencesIn Python, types are automatically determined during the run, not through code declarations. This means that there is no need to declare variables

This article is a summary of the knowledge of the previous study:1. JavaScript supports a variety of data types, such as numeric types, string types, Boolean types, and so on.2. In JavaScript, a string is a series of characters enclosed by an

String SQL = @ "select isnull (I. IntegralSum, 0.0) as IntegralSum, a. AccountSum, u. UserLave, u. AddTime from Bst_User u Left join (select UserId, sum (cast (IntegralCount as numeric (10, 2) as IntegralSum From Bst_Integral where IsOver = 0 group

Previously, I only knew that lm functions in R can be used for linear fitting, just like the function name: LM = Linear Model However, when we need to perform nonlinear fitting today, we need to search for various functions on the Internet,

The ARFF file format used in WEKA is divided into two parts: header and data. The header is used to define the relation name and a series of attribute names and types, such: @RELATION iris @ATTRIBUTE sepallength NUMERIC @ATTRIBUTE

Transferred from: http://blog.csdn.net/yufenghyc/article/details/45869509--1 Examplepostgres=# Select 1/4;? column?----------0(1 row)In PG If you want to do division and want to keep decimals, the method above does not work, because the "/"

Database optimization and SQL optimization summary, SQL optimization SummaryDatabase Optimization Methods1. select the most suitable field attribute MySQL can support access to large data volumes, but generally, the smaller the table in the database,

1. dataset Concept R Data Structure: Includes scalar, vector, matrix, array,Data boxAnd list; Data Types of R: including numeric, numeric, logical (true/false), plural (virtual), and Native (bytes ); Different industries have different names for the

The first way we classify types is to see how many kinds of objects this type of object can hold, and the type of Python, like most other languages, can hold one or more values.(1) Only one type of object can be saved, called Atomic storage/scalar

array_multisort-to sort multiple arrays or multidimensional arrays Description BOOL Array_multisort (array ar1 [, mixed arg [, mixed ... [, array ...]] ) Array_multisort (PHP 4, PHP 5) Returns TRUE if successful, and returns FALSE if it

The 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. Now let's

Batch Guide data table headerSELECT [waybill number],[Waybill number] As [order number],[Waybill number] As [order number],[Waybill number],SUM ([Price] * [Productnum]) as [total order],SUM (CAST (temp.[ Weight] * (CAST (temp. Productnum as DECIMAL (

In SQL Server 2012, several conversion functions have been added to support forced conversions of data types.Since the main use of SQL Server 2008R2, the company's projects to improve development efficiency, many table columns are varchar type, but

This article is a summary of the knowledge of the previous study:1. JavaScript supports a variety of data types, such as numeric types, string types, Boolean types, and so on.2. In JavaScript, a string is a series of characters enclosed in quotation

function bool Array_multisort (array & $arr [, Mixed $arg = Sort_asc [, Mixed $arg = Sort_regular [, mixed $ ...]]) Parameter description: function to sort multiple arrays or multidimensional arrays The first argument is an array, and each

Array_multisort (PHP 4, PHP 5) Array_multisort--Sort multiple arrays or multidimensional arrays Description BOOL Array_multisort (array ar1 [, mixed arg [, mixed ... [, array ...]] ) Returns TRUE if successful, and returns FALSE if it