join - SQL query through an intermediate table - Stack Overflow
Jun 13, 2010 · a different way: Version 2 (as stored procedure) revised. select r.name from recipes r where r.id = (select t1.recipe_id from RecipeIngredients t1 inner join RecipeIngredients t2 on t1.recipe_id = t2.recipe_id and t1.ingredient_id = @recipeId1 and …
mysql - Intermediate SQL Table : What for? - Stack Overflow
Aug 24, 2015 · In this case you need a Teacher-Class intermediary table. A different kind of relationship is 1-N (one to N). A User can have many Telephones, but each Telephone is owned by a single User. In this case, a User's primary key (PK) is exported as a foreign key (FK) into the Telephones table. No need for an intermediary table.
How do I store intermediate data and share it between SQL …
Jul 7, 2011 · Since databases are optimized for joins you should store the expensive-to-get empIds in a table or view, and then join to that. create table; insert ids to that table; join to temp table for free (or for cheap) Since MySQL is allegedly "The world's most popular open source database" here is the syntax from their documentation: Step 1
sql - Foreign key vs intermediate tables - Stack Overflow
Mar 20, 2016 · The intermediate tables are used for many-to-many relationships. For example, an academic database might have Student and Course tables, with a Student_Course (or Transcript) in between. A Student can take many Courses, and a Course can have many Students. It this case a State can only belong to one Country, so the design seems silly.
sql - How to query across three tables joined by an intermediate …
Apr 29, 2012 · Now PROJECT_CATEGORY is an intermediate table so it contains only primary key from PROJECT and CATEGORY like pID and cID. I know how I can write a query if I have a pID in table CATEGORY but in this case I only have intermediate table. So how I can create a query that will check these 3 tables and then it will show me all categories and which ...
What's the standard practice for naming an intermediary table in …
Jun 24, 2010 · I have a table called Product and a table called Shop. Each shop has a list of Products that it sells. I need an intermediate table that has ShopID and ProductID in it. What should I call that table? My mind has drawn a blank. ShopProducts? Edit: Perhaps I should call it "ShopAvailableProducts"? Or is that too confusing.
5+ Intermediate SQL Tables to Arrive at Desired Table, Postgres
Jan 9, 2016 · The first two queries can easily be combined into one query (without and performance impact). The second table does not seem to be used in the final query. @tt: if those intermediate tables are not indexed, that this will most probably perform worse than simply using common table expressions because the overhead of writing permanent tables is much higher than spilling derived tables to disk.
Save the intermediate result of SQL query - Stack Overflow
May 10, 2022 · select * from order_table left join customer_table on order_table.id = customer_table.id Then I want to see count of number of rows (as an easy example) select count(*) from table But I do not know what this table should be. How may I save the result of above query in some logical table or how to refer to what was created before in SQL.
Get information from another table using intermediate table
Books_has_author is an intermediate table which contains only the primary keys form other two tables. I am trying to write an sql query which will return me all the books name written by a particular author. I am new to relational database concepts …
sql server - What is the difference between Junction and …
Oct 12, 2022 · Personally, I use the term association table but junction table and others are also used. The term Intermediate table is overloaded and may refer to temp tables to store intermediate query results. – Dan Guzman