spark sql date functions

Ggregate Functions (Transact-SQL) aggregation functionsAvg: Averaging pointsCount: Number of calculationsMax: Ask for maximum valueMin: Find minimum valueSum: SumFind Average heightSelect AVG (Shengao) from studentAs: Added column nameSelect AVG (Shengao) as average height from studentFind the numberSelect COUNT (*) from student where Xingbie = ' Male 'Ask for maximumSelect MAX (Shengao) from studentTo find

Spark SQL requires several "tables" to be present, either from hive or from a temporary table. If the table is from hive, its schema (column name, column type, and so on) has been determined at the time of creation, normally we can parse the data in the table directly from spark SQL, and if "table" comes from "temporal

Tags: SHUF implementation. So data operator class yarn spark SQL Boost performanceSelection of storage formats:Do you take row or column-type storage? The number of times a column store is written, and the loss time is much faster when queriedselection of compression formats:Consider the compression speed and the compressed file of the partition compression can be less storage space, improve data transfer s

Operating EnvironmentCluster Environment: CDH5.3.0The specific jar versions are as follows:Spark version: 1.2.0-cdh5.3.0Hive Version: 0.13.1-cdh5.3.0Hadoop version: 2.5.0-cdh5.3.0Simple Java version of Spark SQL sample Spark SQL directly queries JSON-formatted data Custom

Products A table of changes in the price of goods, orders, records each purchase of goods and datesMatch orders and products based on a non-equivalent join in Spark SQL, counting the prices of the items in each orderSlow-changing commodity price listWangzai milk, there was a price change.scala> val products = sc.parallelize(Array( | ("旺仔牛奶", "2017-01-01", "2018-01-01", 4), | ("旺仔牛奶", "2018-01-02

The pitfall encountered by date functions such as new date in JavaScript in safari, datesafari Recently, when I was working on mobile Web, Chrome debugging was successful on the PC, but a strange problem occurred when I tested the iPhone. After a series of debugging, it is found that there is a problem with the date.

/** Spark SQL Source Analysis series Article */In the world of SQL, in addition to the commonly used processing functions provided by the official, extensible external custom function interface is generally provided, which has become a fact of the standard.In the previous article on the core process of

Tags: word common sql interval according to name Val Sina ICACurdate () or current_date () returns the current dateCurtime () or Current_time () returns the current timeDate_add (date,interval int keyword) returns the date plus the result of the interval int (int must be formatted according to the keyword), such as: Selectdate_add (Current_date,interval 6 MONTH);

###Createdata## Cat/Dev/Urandom|Head-1 |Md5sum|Head-C8# # echo "$ (date+%s) "|Sha256sum|Base64|Head-C -; echo## Cat/Dev/Urandom|Awk'nr==1{print $0| " Md5sum|base64|grep-eo'^. { -}'"; exit}' forIinch{1..100000}do passwd=$ (Echo $RANDOM|Md5sum|Head-C8) echo "${i},${passwd}" done>/Tmp/Tmpa--CREATE TABLE UseXt_cfbdm_safe;Create TableTmpa (ID string,name string) ROW FORMAT delimited fields TERMINATED by ','stored astextfile;###CreateHqlfileCat>/Tmp/Tmpa.q'

Common SQL Server date comparison and date query statements In SQL Server, you may need to obtain the current date and calculate some other dates. For example, your program may need to determine the first or last day of a month. Most of you probably know how to divide a