group-by

问题 I have a complicated problem I am trying to solve. Please bear with me and feel free to ask any questions. I am quite new to SQL and having difficulty with this... I need to count the median of a group of values. Now the values are not given in a table. The values are derived from a table based on hourly occurrences grouped by date. Here's the sample table from where data is pooled. CREATE TABLE Table22( Request_Number BIGINT NOT NULL ,Request_Received_Date DATETIME NOT NULL ); INSERT INTO

问题 I've been struggling to recreate this Excel graph in python using matlplotlib: The data is in a dataframe; I'm trying to automate the process of generating this graph. I've tried unstacking my dataframe, subplotting, but I haven't managed to create the "Zone" index which is so elegant in Excel. I have successfully managed to plot the graph without this "Zone" index, but that's not really what I want to do. Here is my code: data = pd.DataFrame( { 'Factory Zone': ["AMERICAS","APAC","APAC","APAC

问题 I've been struggling to recreate this Excel graph in python using matlplotlib: The data is in a dataframe; I'm trying to automate the process of generating this graph. I've tried unstacking my dataframe, subplotting, but I haven't managed to create the "Zone" index which is so elegant in Excel. I have successfully managed to plot the graph without this "Zone" index, but that's not really what I want to do. Here is my code: data = pd.DataFrame( { 'Factory Zone': ["AMERICAS","APAC","APAC","APAC

问题 I'd like to SELECT rows from a database table and group them using PHP instead of SQL based on a parameter (in this case by item). SQL: Clothes table id item owner 1 shoes joe 2 pants joe 3 hat joe 4 pants joe 5 hat tom SELECT * from Clothes where owner='joe' 1 shoes joe 2 pants joe 3 hat joe 4 pants joe Here's how I'd like the results to look after using PHP instead of SQL's GROUP BY item PHP : 1 shoes joe 2 pants joe //count 2 3 hat joe I'm sure there is a PHP array function for this I'm

问题 I have an SQL statement that looks so: select FY_CD, PD_NO, INPUT, SUM(HOURS) from LABOR_TABLE group by PD_NO, INPUT; Returning this: FY_CD|PD_NO| INPUT | HOURS 2008 1 Actuals 61000 2008 1 Baseline 59000 2008 2 Actuals 54000 2008 2 Baseline 59000 2008 3 Actuals 60000 2008 3 Baseline 70000 I'm trying to figure out how to subtract the Actual values from the Baseline values for each period, returning the following: FY_CD|PD_NO| INPUT | HOURS 2008 1 Variance 2000 2008 2 Variance -5000 2008 3

问题 data set exist data with age, gender, state, income, group . Group represents the group that each user belongs to: group gender state age income 1 3 Female CA 33 $75,000 - $99,999 2 3 Male MA 41 $50,000 - $74,999 3 3 Male KY 32 $35,000 - $49,999 4 2 Female CA 23 $35,000 - $49,999 5 3 Male KY 25 $50,000 - $74,999 6 3 Male MA 21 $75,000 - $99,999 7 3 Female CA 33 $75,000 - $99,999 8 3 Male MA 41 $50,000 - $74,999 9 3 Male KY 32 $35,000 - $49,999 10 2 Female CA 23 $35,000 - $49,999 11 3 Male KY

问题 Below is the schema for the athena table I wish to calculate median for 'parameter_value' group by standard_lab_parameter_name & units. For this I followed link : https://docs.aws.amazon.com/redshift/latest/dg/r_MEDIAN.html But on running the query select median(parameter_value) from table_name group by standard_lab_parameter_name, units It throws error SYNTAX_ERROR: line 1:8: Function median not registered Any help? Or if some alternative query would be great 回答1: Athena is based on Presto 0

问题 Below is the schema for the athena table I wish to calculate median for 'parameter_value' group by standard_lab_parameter_name & units. For this I followed link : https://docs.aws.amazon.com/redshift/latest/dg/r_MEDIAN.html But on running the query select median(parameter_value) from table_name group by standard_lab_parameter_name, units It throws error SYNTAX_ERROR: line 1:8: Function median not registered Any help? Or if some alternative query would be great 回答1: Athena is based on Presto 0

问题 I'm going from SQLite to Postgresql. This has made one of my queries not work. It's not clear to me why this query is allowed in SQLite, but not in Postgresql. The query in question is below in the find_recent_by_section_id_list() function. I've tried rewriting the query in multiple ways, but what is confusing me is that this query worked when I was working with SQLite. The setup is Flask, SQLAlchemy, Flask-SQLAlchemy and Postgresql. class SectionStatusModel(db.Model): __tablename__ =

问题 i have a table with records that are updated every minute with a decimal value (10,2). To ignore measure errors i want to have the number that has been inserted the most. Therefor i tried : SELECT date_time,max(sensor1),count(ID) FROM `weigh_data` group by day(date_time),sensor1 This way i get the number of records ` Datetime sensor1 count(ID) 2020-03-19 11:49:12 33.22 3 2020-03-19 11:37:47 33.36 10 2020-03-20 07:32:02 32.54 489 2020-03-20 00:00:43 32.56 891 2020-03-20 14:20:51 32.67 5 2020