sql count (including null) from table where two conditions
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I have two tables one is team_stats and the other is team_summary. There are 16 tNames in team_summary and 1 means win, 0 means lose in win_lose column on team_stats.
team_summary team_stats tName W Period tName win_lose AUT null 1 AUT 1 CAN null 2 AUT 1 DEN null 3 AUT 1 FIN null Total AUT 1 ... 1 CAN 0 2 CAN 0 ...
I want to insert into W column on team_summary. When I query
select tName, count(*) from team_stats where Period='Total' and (win_lose) = 1 group by tName;
returns like this with 14 rows not including 0 count.
tName count(*) AUT 1 CAN 6 DEN 4 ...
I want to take 16 rows including those 14 values and 2 values which are 0 (or null).
How do I do this?
You seem to want an
update team_summary ts left join (select tName, count(*) as wins from team_stats where Period = 'Total' and (win_lose) = 1 group by tName ) t on ts.tName = t.tName set ts.summary = coalesce(t.wins, 0);
SQL: COUNT Function, This is the column or expression whose non-null values will be counted. tables: The tables that you wish to retrieve records from. There must be at least one table This works in T-SQL. If you're just counting the number of something and you want to include the nulls, use COALESCE instead of case. IF OBJECT_ID('tempdb..#us') IS NOT NULL DROP TABLE #us CREATE TABLE #us ( a INT NULL ); INSERT INTO #us VALUES (1),(2),(3),(4),(NULL),(NULL),(NULL),(8),(9) SELECT * FROM #us SELECT CASE WHEN a IS NULL THEN 'NULL' ELSE 'NON-NULL' END AS 'NULL?', COUNT(CASE WHEN a
You can try below - by removing
win_lose = 1 from your where clause
select tName, count(*) from team_stats group by tName
If you have 16 teams in team_stats and each of them has the "Total" information, then you simply need:
select tName, win_lose from team_stats where Period='Total';
If you wish to know how many times each team appears in the team_stats table:
select tName, count(tName) from team_stats group by tName;
SQL Server COUNT Function By Practical Examples, This tutorial shows you how to use the SQL Server COUNT() function to get the It counts each row separately and includes rows that contain NULL values. CREATE TABLE t( val INT ); INSERT INTO t(val) VALUES(1),(2),(2),(3),(null),(null) I have a table with two columns that might be null (as well as some other columns). I would like to count how many rows that have column a, b, both and neither columns set to null.
Overview of the SQL Count Distinct Function, It also includes the rows having duplicate values as well. SQL COUNT Distinct does not eliminate duplicate and NULL values from the result set. In this example, we have a location table that consists of two columns City and State. It returns the total number of rows after satisfying conditions specified The SQL COUNT() function returns the number of rows in a table satisfying the criteria specified in the WHERE clause. It sets the number of rows or non NULL column values. COUNT() returns 0 if there were no matching rows.
NULL Values and the GROUP BY Clause, Let's start by executing a simple SQL query with both the GROUP BY clause and NULL So, we can conclude that COUNT doesn't include NULL values. or conditions that include a NULL to return an UNKNOWN result. You can use this technique to solve your problem. To count the number of times Dateout is not set, you can use SELECT SUM (CASE Dateout WHEN NULL THEN 1 ELSE 0 END) FROM table_name. You can also nest the CASE statements. So to count the number of times Dateout is not populated and Datein is, the query will look something like this:
COUNT Function, The notation COUNT(*) includes NULL values in the total. before counting, and to count the combinations of values across multiple columns. See OPTIMIZE_PARTITION_KEY_SCANS Query Option (Impala 2.5 or higher only) for the for a column? select count(c1) from t1; -- Count the rows that meet certain conditions. Another form of the COUNT function that accepts an asterisk (*) as the argument is as follows: COUNT(*) The COUNT(*) function returns the number of rows in a table including the rows that contain the NULL values. SQL COUNT function examples. Let’s take some examples to see how the COUNT function works.
- Do you really have a total row for each team and if so why isn't it the sum of all the periods and why do you need to group by?
- @P.Salmon 1,2,3, Total are included in each game. I want to sum to get that information in a season.
- Thanks a lot. It helps me out!
- Do you mind if you explain that query? I am trying to understand but I want to know exact one. Especially, why do we need left join in that case?
- @skJin . . . You need t use
left joinbecause you want to update all rows in
team_summary, not just the ones that match the conditions in the
- Got it. Thanks you!