Simple SQL Tutorial finding Monthly count using count GroupBy Month скачать в хорошем качестве

Simple SQL Tutorial finding Monthly count using count GroupBy Month

Simple_SQL_Tutorial_finding_Monthly_count_using_count()_GroupBy_Month()_#SQL_#Aggregate_#Monthly_#Count Please like the video if it helps you :) Simple example and short video to illustrate how to query database to return monthly count of transaction records. This is useful for plotting aggregated value charts. == More on how to use W3School == It uses online website https://www.w3schools.com/sql/ You can watch the below Video on more details to on how to use this website to start exploring and learning SQL.    • Simple SQL Tutorial Exploration without ha...   This video first shows all the columns inside the Orders table. It then shows how you could use SELECT to filter to display just the OrderDate column. Since we wish to find monthly count, we use Format() to format date to display only Year and Month information. Note: You can actually filter all rows to a particular year, then you just need the month information. In that case, you can use MONTH() instead of FORMAT(). We next use GROUP BY to group all the same Year-Month values together to appear as 1 row. So we can see how many months of transaction in the database. We see that the Orders Table contains Order Transactions for 8 different months. In order to see how many rows are being grouped together within each month, we use the COUNT() Function. We need to specify a column in COUNT(). We can actually use any column but we usually use the Unique Identifier column. In this case we use OrderID. COUNT(OrderID). We use AS to give a name to this result column. We name it Recs. We then have the counts of transactions for the different months. This information may be be useful to plot analytic charts. == Commands used in this tutorial == SELECT - specify which column information to display - * means all columns COUNT() - get number of rows that fulfill the criteria) AS - give a name to the output column MONTH() - to return only the month of the date from 1 - 12 FORMAT() - To change the display information of the Date GROUP BY - To group rows according to the values provided. == Using MONTH() == If you have set up the query to return records for only 1 year, you can actually group them by month using the below Query. SELECT count(OrderID) As Recs,Month(OrderDate) FROM Orders group by Month(OrderDate) ; You can then plot them into charts. The below video shows an example    • How to plot aggregated Value Column Charts...   == Using GROUP BY == Group by are used to group rows together using specific values of column. Note that when you use group by, the Select column cannot have a different value within each grouping. For example you cannot SELECT OrderID when you GROUP BY OrderDate since all the rows with the same OrderDate have different OrderID. You can SELECT OrderDate since all the rows grouped together have the same OrderDate value. The GROUP BY statement is often used with aggregate functions (COUNT(), MAX(), MIN(), SUM(), AVG()) to group the result-set by one or more columns. (See https://www.w3schools.com/sql/sql_gro...) Hope these inputs are helpful for you. 0:00 - Display all columns of Orders Table 0:28 - SQL SELECT to filter and display only OrderDate column 0:45 - SQL FORMAT() Functions to display date in year and month 'yyyy MM' 01:10 - SQL GROUP BY to group all the same Year-Month combination together 01:34 - SQL COUNT() Function to count all the rows within each grouping Keywords: #sql #sqlserver #database #select #month() #count() #Group #GroupBy #As #aggregate #count #monthly #format #how #short #simple #learn #easy #beginner #explore #tutorial #basic #w3school #query #*