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SQL JOIN: what is the difference between WHERE clause and O…
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1159edited Dec 5, 2022 at 7:31
They are not the same thing.
Consider these queries:

SELECT *
FROM Orders
LEFT JOIN OrderLines ON OrderLines.OrderID=Orders.ID
WHERE Orders.ID = 12345
and

SELECT *
FROM Orders
LEFT JOIN OrderLines ON OrderLines.OrderID=Orders.ID
AND Orders.ID = 12345
The first will return an order and its lines, if any, for order number 12345. The second will return all orders, but only order 12345 will have any lines associated with it.
With an INNER JOIN, the clauses are effectively equivalent. However, just because they are functionally the same, in that they produce t...
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Data Class
https://dataclass.co/sql-join-with-where-clause
How To Join With A WHERE Clause In SQL - Data Class
A WHERE clause is the most common and straightforward way to filter SQL query results. It’s often used in conjunction with a WHERE clause, although the logic can get a little more complicated. To join with a WHERE clause, simply place the WHERE clause after the join (s) but before any other clauses. … See more
Example: SQL Join with Where
Let’s say we want to retrieve all male employees (i.e. Bob and Andrew) plus their titles if available. There are multiple solutions, but one is LEFT JOIN with … See more
Filtering with Inner Join vs. Where
As mentioned earlier, inner joins can have their own filtering effects. For instance, we could get an identical result by rewriting the previous query as follows: … See more
Handling Null with Where & Join
When a WHEREclause refers to a join, think carefully about potential NULL values. Here are the most common implications to consider. First, an inner join will … See more
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sql - Condition within JOIN or WHERE - Stack Overflow
WEBIs there any difference (performance, best-practice, etc...) between putting a condition in the JOIN clause vs. the WHERE clause? For example... -- Condition in JOIN. SELECT * …
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The relational algebra allows interchangeability of the predicates in the WHERE clause and the INNER JOIN , so even INNER JOIN queries with W...
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202
For inner joins I have not really noticed a difference (but as with all performance tuning, you need to check against your database under your cond...
182
Most RDBMS products will optimize both queries identically. In "SQL Performance Tuning" by Peter Gulutzan and Trudy Pelzer, they tested multiple b...
31
WHERE will filter after the JOIN has occurred. Filter on the JOIN to prevent rows from being added during the JOIN process.
16
I prefer the JOIN to join full tables/Views and then use the WHERE To introduce the predicate of the resulting set. It feels syntactically cleaner.
3
Agree with 2nd most vote answer that it will make big difference when using LEFT JOIN or RIGHT JOIN . Actually, the two statements below are equ...
3
I typically see performance increases when filtering on the join. Especially if you can join on indexed columns for both tables. You should be ab...
2
Joins are quicker in my opinion when you have a larger table. It really isn't that much of a difference though especially if you are dealing with a...
0
Putting the condition in the join seems "semantically wrong" to me, as that's not what JOINs are "for". But that's very qualitative. Additional pro...
SQL JOIN where to place the WHERE condition?
SQL JOIN: what is the difference between WHERE clause and ON clause ...
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INNER JOIN condition in WHERE clause or ON clause?
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WEBJul 22, 2021 · The purpose of the ON clause is to specify the join conditions, that is, to define how the tables should be joined. Specifically, you define how the records should be matched. In contrast, the purpose …
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Join condition vs. WHERE...does it make a performance difference?
I've developed a habit of separating joi…
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Expanding on SMor's comment: The short ans…
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best practices - What is more efficient, a where clause or a join with ...
We run a website that has 250MM rows in on…
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For modern RDBMS there is no difference betwee…
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Condition within JOIN or WHERE.
Is there any difference (performance, best-practice, etc...) between putting a condi…
Answer · 179 votes
The relational algebra allows interchangeabilit…
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How does LEFT JOIN with WHERE clause works?
Given the query below SELECT * FROM tableA LEFT JOIN table…
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The query optimizer will decide and it is pretty s…
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Joining SQL queries with where clause.
I have 2 tables in a MYSQL database wich look like this: Klant: ID Naam Em…
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SELECT * FROM Klant t1 JOIN SELECT ID, Titel …
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WHERE clause with JOIN SQL.
SELECT AVG(score) AS avg_score, st.name FROM firstTable AS ft LEFT JOIN secondTabl…
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You should use an INNER join since you want onl…
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SQL JOIN where to place the WHERE condition?
I have two following examples. 1. Example (WHERE) SELECT 1 F…
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If a filter enters in a JOIN condition functionally (i.…
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Difference between "and" and "where" in joins.
Whats the difference between SELECT DISTINCT field1 FROM …
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Firstly there is a semantic difference. When you h…
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INNER JOIN ON vs WHERE clause.
For simplicity, assume all relevant fields are NOT NULL . You can do: SE…
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INNER JOIN is ANSI syntax that you should …
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https://learnsql.com/blog/sql-joins-complete-guide
Your Complete Guide to SQL JOINs (with Resources)
WEBJan 25, 2024 · SQL Basics. SQL JOINs. More JOIN Practice. Advanced JOIN Techniques. How to JOIN Two Tables in SQL. How to JOIN 3 or More Tables. LEFT JOIN. How to …
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SQL Joins Using WHERE or ON | Intermediate SQL - Mode
WEBThis lesson of the SQL tutorial for data analysis covers the differences between filtering joined data using WHERE or ON. ON filters data before tables are joined; WHERE …
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SQL JOIN WHERE - Syntax, Use Cases, and Examples | Hightouch
WEBThe syntax for using SQL JOIN with WHERE clause is as follows: SELECT column_list. FROM table1. JOIN table2 ON table1.column_name = table2.column_name. WHERE …
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What is on clause in SQL joins?Practice SQL JOINs with our interactive SQL JOINs course. The purpose of the ON clause is to specify the join conditions, that is, to define how the tables should be joined. Specifically, you define how the records should be matched.
What Is the Difference Between WHERE and ON in SQL JOINs?
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How do I add a 'where' clause to a join?If you are doing a LEFT JOIN, add any WHERE conditions to the ON clause for the table in the right side of the join. This is a must, because adding a WHERE clause that references the right side of the join will convert the join to an INNER JOIN. The exception is when you are looking for the records that are not in a particular table.
SQL JOIN: what is the difference between WHERE clause and ON clause
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Where should a condition be put in a join clause?I would personally put the condition in the JOIN clause if the condition describes the relation. Generic conditions that just filter the result set would go to the WHERE part then. E.g. FROM Orders JOIN OrderParties ON Orders.Id = OrderParties.Order AND OrderParties.Type = 'Recipient' WHERE Orders.Status = 'Canceled'
sql - Condition within JOIN or WHERE - Stack Overflow
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What is the difference between join & where clause?The ON clause is primarily used in JOIN operations to define how tables are connected based on related columns. In contrast, the WHERE clause filters the results after the JOIN is executed. Suppose you want to list all authors with all their books – but only with the books that have a capital M in the title.
SQL JOINs: Your Complete Guide to the Best Resources (with Cheat Sh…
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SQL Full Outer Join Using Where Clause - GeeksforGeeks
WEBAug 25, 2021 · FULL OUTER JOIN using WHERE CLAUSE : The use of WHERE clause with FULL OUTER JOIN helps to retrieve all those rows which have no entry matching on joining both the tables having NULL …
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SQL Joins - W3Schools
WEBSep 18, 1996 · A JOIN clause is used to combine rows from two or more tables, based on a related column between them. Let's look at a selection from the "Orders" table: Then, …
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https://learnsql.com/blog/sql-join-examples-…
7 SQL JOIN Examples With Detailed Explanations
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SQL WHERE Clause - Joining Tables - All Things SQL
WEBJoining tables using a WHERE clause can replace a JOIN condition. Many databases do not support outer joins and should be used with caution.
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GeeksForGeeks
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SQL Query to select Data from Tables Using Join and Where
WEBApr 27, 2021 · An SQL join statement is used to combine rows or information from two or more than two tables on the basis of a common attribute or field. There are basically four …
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https://stackoverflow.com/questions/2559194
Difference between "and" and "where" in joins - Stack Overflow
WEBJun 7, 2010 · When you use the WHERE clause, you are saying that the relationship is defined by cd.Company = table2.Name and that you only want the rows where the …
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https://dba.stackexchange.com/questions/165642
How does LEFT JOIN with WHERE clause works?
WEBFeb 27, 2017 · SELECT * FROM tableA LEFT JOIN tableB ON tableB.id = tableA.id WHERE tableB.school = 'EE' That changes the left join into an inner join but since there …
Join condition vs. WHERE...does it make a performance difference? Oct 12, 2021
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INNER JOIN ON vs WHERE clause in MySQL - GeeksforGeeks
WEBFeb 16, 2024 · The INNER INNER JOIN with ON syntax in MySQL is used to combine rows from two or more tables based on a related column between them. Syntax: SELECT …
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Join with where clause - Ask TOM
WEBOct 20, 2017 · SQL> create table b as select * from a; Table created. SQL> set autotrace traceonly explain. SQL> select * 2 from A left join B. 3 on a.id = b.id. 4 where b.owner = …
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WEBMay 10, 2022 · For the filtering conditions to be executed properly, the WHERE clause should be placed after FROM and JOIN and before GROUP BY , HAVING, and ORDER …
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join - Joining SQL queries with where clause - Stack Overflow
WEBMar 19, 2013 · SELECT * FROM klant JOIN mail ON klant.mail_id = mail.id and this would return a row for every matching pair of rows in the two tables. Alternatively you could …
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WEB5 days ago · In SQL, understanding when to use JOIN versus UNION can significantly impact the efficiency and clarity of your queries.JOIN combines columns from related …
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sql - INNER JOIN ON vs WHERE clause - Stack Overflow
WEBYou can do: SELECT. table1.this, table2.that, table2.somethingelse. FROM. table1, table2. WHERE. table1.foreignkey = table2.primarykey. AND (some other conditions) Or else: …
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WHERE clause with JOIN SQL - Stack Overflow
WEBJan 3, 2022 · You should use an INNER join since you want only dogs that match in both tables and add the condition in the HAVING clause: SELECT AVG(ft.score) AS …
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Join condition vs. WHERE...does it make a performance difference?	Oct 12, 2021
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