Is there a way to count and loop with plain SQL?
for loop in sql query example
while loop in sql select statement
sql loop through select results
sql for loop insert
sql server loop through table and update
sql while loop counter
for loop in sql server stored procedure
I have the following tables:
albumID, albumTitle, albumReleaseDate, albumLabel, albumDigitalImg, albumCoverStory
trackID, albumID, recordingID, albumTrackNumber, cd
italic = primary key
bold = foreign key
The question is as follows:
List the total number of tracks on each album that has any. Give the column containing the total number of tracks a sensible name and use albumId to identify each total.
My only idea would be to iterate over each albumID and check how many tracks are assigned to it but obviously loops aren't a thing in plain SQL? Is there any way to do this using plain SQL?
This only checks how many tracks are assigned for albumID 1, not for all albums and I'm really lost as to how I could do this without a loop.
SELECT COUNT(albumID) FROM albumTrack WHERE albumID = 1;
I'm using Oracle.
Below query will give you the number of tracks against each albumID,if any.
SELECT albumID,count(trackID) as NumberOfTracks FROM albumTrack Group By albumID;
LOOP and COUNT in a SELECT statement SQL SERVER, Is there a way how to do this in one select statement to loop each user and count for all users at SQL operates best in set based operations returning recordsets with many rows. I think what you're really after is the count(distinct column) in combination with a group by on userID and region . To put this in plain English. A loop is a program structure that executes statements repeatedly. This avoids duplication of program code as we may not know how many times the relevant statements should be executed. Normally, it is recommended to use an exit condition to terminate the loop. Otherwise, the loop may iterate infinitely. There are three main types of loops in PL/SQL
You can try:
Select ab.albumID, Count(Distinct trackID) As trackCount From album ab Inner Join albumTrack at on at.albumID = ab.albumID Group By ab.albumID;
This will give the count of tracks for each album.
SQL While loop: Understanding While loops in SQL Server, The article explains how to use the SQL While loop in Microsoft SQL Next, we execute a While loop which checks if the value of the @count� The SQL COUNT(), AVG() and SUM() Functions. The COUNT() function returns the number of rows that matches a specified criterion. The AVG() function returns the average value of a numeric column. The SUM() function returns the total sum of a numeric column. COUNT() Syntax
The question asks for the counts per albumID.
For just that, a select on albumTrack alone with a
GROUP BY on the albumID should be sufficient.
SELECT albumID, COUNT(*) AS TotalTracks FROM albumTrack GROUP BY albumID ORDER BY albumID
But if albumTrack.albumID can be NULL, or isn't a foreign key on album.albumID?
INNER JOIN on the "album" table should still be used.
To make sure that it only counts for albumID's that actually exist in the "album" table.
SELECT tracks.albumID, COUNT(*) AS TotalTracks FROM albumTrack AS tracks JOIN album ON album.albumID = tracks.albumID GROUP BY tracks.albumID ORDER BY tracks.albumID
And if you'd like to show the counts per albumTitle:
SELECT a.albumTitle, COUNT(t.trackID) AS TotalTracks FROM album a JOIN albumTrack t ON t.albumID = a.albumID -- WHERE a.albumID = 1 GROUP BY a.albumID, a.albumTitle ORDER BY a.albumTitle
SQL WHILE loop with simple examples, SQL WHILE loop provides us with the advantage to execute the SQL statement(s) repeatedly until the specified condition result turn out to be� SQL COUNT ( ) with group by and order by . In this page, we are going to discuss the usage of GROUP BY and ORDER BY along with the SQL COUNT() function. The GROUP BY makes the result set in summary rows by the value of one or more columns. Each same value on the specific column will be treated as an individual group.
Running SQL Queries in a Loop, In SQL there is only one type of loop, and this blog explains how it works! use a loop to execute a query multiple times, using a different value in the The @ NumFilms variable is used to count how many films have won the� Inside the loop, the execution can be controlled with the BREAK and CONTINUES statements. BREAK causes an exit from the loop and CONTINUE causes the loop to restart and move to the next iteration. In the T-SQL code below, a loop increments an value (@COUNTER) from 0 to 10 and prints it.
Avoid Using COUNT() in SQL When You Could Use EXISTS , and how to replace them with equivalent EXISTS queries. exist COUNT(*) needs to return the exact number of rows. FOR i IN 1..v_repeat LOOP 2020; Using Java 13+ Text Blocks for Plain SQL with jOOQ March 5, 2020� This SQL Server tutorial explains how to use the WHILE LOOP in SQL Server (Transact-SQL) with syntax and examples. In SQL Server, you use a WHILE LOOP when you are not sure how many times you will execute the loop body and the loop body may not execute even once.
LOOP Statements, If and only if the value of this expression is TRUE , the statements after LOOP execute. cursor_for_loop_statement. Issues a SQL query and loops through the� Pros and Cons of Using a While Loop to Iterate Through Table Rows in SQL Server. There are also benefits to use a WHILE loop compared to a cursor. While loops are faster than cursors. While loops use less locks than cursors. Less usage of Tempdb: While loops don’t create a copy of data in tempdb as a cursor does.
- Kindly share some sample data and desired output.
- sample data and desired output: i.imgur.com/DFsxJBk.png
- The question is trivial. And answer for its is each sql tutorial. (count employees in department) Type of rdbms is not relevant here.