sql for data analysis udacity

. This chapter explains how to use external data sources to manipulate data in hive, parquet, MySQL, and integrated use8th Chapter Sparksql VisionThis chapter will explain the Spark's vision: Write less code, read less data, and let the optimizer automatically optimize the programThe 9th Chapter MU Lesson Net Diary actual combatThis chapter uses spark

If you have a shopping website, how do you recommend products to your customers? This function is available on many e-commerce websites. You can easily build similar functions through the data mining feature of SQL Server Analysis Services. It is divided into three parts to demonstrate how to implement this function. 1. Build a Mining Model 2. Compile service in

I. Scenarios In SQL Server 2005, there is a table TestDatetime, where the data type of the Dates field is datetime. If you see a table record, what do you first think? Figure 1: Data List) When you see this data, do you think this design is a waste of storage space and makes the index of this column increase, making t

Last week Spark1.2 just released, the weekend at home nothing, to understand this feature, by the way to analyze the source code, see how this feature is designed and implemented./** Spark SQL Source Analysis series Article * /(Ps:external datasource Use article address: Spark SQL External DataSource External Data sour

If you have a shopping website, how do you recommend products to your customers? This function is available on many e-commerce websites. You can easily build similar functions through the data mining feature of SQL Server Analysis Services. This article mainly demonstrates how to organize data according to the requir

If you have a shopping website, how do you recommend products to your customers? This function is available on many e-commerce websites. You can easily build similar functions through the data mining feature of SQL Server Analysis Services. It is divided into three parts to demonstrate how to implement this function. 1. Build a Mining Model 2. Compile service in

If you have a shopping website, how do you recommend products to your customers? This function is available on many e-commerce websites. You can easily build similar functions through the data mining feature of SQL Server Analysis Services. The previous article describes how to use DMX to create a mining model. This article describes how to create a mining model

of extraction, number of bits extracted) 2) Example: Extracting Province code, county code, date of birth from the ID number SELECT ID number, left (identity number, 2) as province code, Mid (identity number, 7,4) as year, Mid (identity number, 11,2) as month, Mid (identity number, 13,2) as day, Mid (identity number, 17,1) as gender from user details; 5. Random sampling: A method of extracting samples according to the stochastic principle Example: Randomly extracting 20 records SELECT TOP 20 *

Data Page cache is the main aspect of SQLServer memory usage and the most occupied part. On a stable DBServer, the memory usage is relatively stable. Data Page cache is the main aspect of the memory usage of SQL Server, and also the most occupied part. On a stable DB Server, the memory usage is relatively stable. SQL

server|sqlserver| data The construction and analysis of SQL Server Data Warehouse (i) Basic concepts: 1. Cubes: Cubes are the primary object in online analytical processing (OLAP) and are a technology that allows fast access to data in a