is where faster than join ?

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https://stackoverflow.com/questions/1129923/is-a-join-faster-than-a-where

https://stackoverflow.com/questions/1129923/is-a-join-faster-than-a-where
sql – Is a JOIN faster than a WHERE? – Stack Overflow
Is a JOIN faster than a WHERE? Asked 14 years, 4 months ago Modified 3 years, 3 months ago Viewed 77k times 70 Suppose I have two tables that are linked (one has a foreign key to the other):

https://dba.stackexchange.com/questions/3480/what-is-more-efficient-a-where-clause-or-a-join-with-million-plus-row-tables

https://dba.stackexchange.com/questions/3480/what-is-more-efficient-a-where-clause-or-a-join-with-million-plus-row-tables
best practices – What is more efficient, a where clause or a join with …
What is more efficient, a where clause or a join with million plus row tables? Ask Question Asked 12 years, 5 months ago Modified 6 years, 2 months ago Viewed 143k times 27 We run a website that has 250MM rows in one table and in another table that we join it to for most queries has just under 15MM rows. Sample structures:

https://stackoverflow.com / questions / 6777910 / sql-performance-on-left-outer-join-vs-not-exists

https://stackoverflow.com / questions / 6777910 / sql-performance-on-left-outer-join-vs-not-exists
SQL performance on LEFT OUTER JOIN vs NOT EXISTS
4 Answers Sorted by: 77 Joe’s link is a good starting point. Quassnoi covers this too. In general, if your fields are properly indexed, OR if you expect to filter out more records (i.e. have a lots of rows EXIST in the subquery) NOT EXISTS will perform better.

https://www.mssqltips.com/sqlservertip/6659/sql-exists-vs-in-vs-join-performance-comparison

https://www.mssqltips.com/sqlservertip/6659/sql-exists-vs-in-vs-join-performance-comparison
SQL EXISTS vs IN vs JOIN Performance Comparison – SQL Server Tips
Solution As with many situations within SQL Server the answer depends on the circumstances. This tip will look at the pros and cons of each method and use a repeatable methodology to determine which method will offer the fastest performance.

https://dba.stackexchange.com/questions/270389/is-a-join-faster-with-5-tables-joined-together-or-5-separate-queries

https://dba.stackexchange.com/questions/270389/is-a-join-faster-with-5-tables-joined-together-or-5-separate-queries
mysql – Is a join faster with 5 tables joined together Or 5 separate …
Are individual queries faster than joins? (4 answers) Closed 3 years ago. I have confusion that I already have in my application 5 tables say a,b,c,d,e and have relationship with each other like a.b_id is primary key of b and chain goes on.

https://dba.stackexchange.com/questions/133315/filter-first-then-join-or-join-first-then-filter

https://dba.stackexchange.com/questions/133315/filter-first-then-join-or-join-first-then-filter
sql server – Filter first then join or join first then filter …
Consider 5 tables with more than 1 billion records each. A query needs to join them. And I know that less than 10% of their records will be require. Say they all have a Date dimension, and only data from current month is needed. What should be faster: 1) Use a simple SELECT: join all tables, then filter () each table’s dimension for …

https://stackoverflow.com/questions/227037/can-i-get-better-performance-using-a-join-or-using-exists

https://stackoverflow.com/questions/227037/can-i-get-better-performance-using-a-join-or-using-exists
Can I get better performance using a JOIN or using EXISTS?
Can I get better performance using a JOIN or using EXISTS? Ask Question Asked 15 years ago Modified 11 years, 7 months ago Viewed 70k times 38 I have two tables Institutions and Results and I want to see if there are any results for institutions that way I can exclude the ones that don’t have results.

https://stackoverflow.com/questions/7892561/mysql-inner-join-or-in-which-is-faster

https://stackoverflow.com/questions/7892561/mysql-inner-join-or-in-which-is-faster
mysql – INNER JOIN or IN. Which is faster? – Stack Overflow
5 Answers Sorted by: 2 They both look fairly similar to my eyes. I’m pretty sure that a single SELECT will provide better performance, given that MySQL is not particularly good with subqueries: SELECT t1.* FROM table_users t1 INNER JOIN table_towns t2 ON t1.user_town = t2.town

https://learn.microsoft.com/en-us/answers/questions/945643/which-is-best-for-performance-filtering-on-where-o

https://learn.microsoft.com/en-us/answers/questions/945643/which-is-best-for-performance-filtering-on-where-o
which is best for performance filtering on where or filtering on join …
28 juil. 2022Hi,@ahmed salah These two queries will go to the same execution plan with basically no difference in performance, such as doing something like this: SELECT * FROM TableA a LEFT JOIN TableXRef x ON x.TableAID = a.ID AND a.ID = 1 LEFT JOIN TableB b ON x.TableBID = b.ID or this: SELECT * FROM TableA a LEFT TableXRef x ON x.TableAID = a.ID LEFT TableB b ON b.id = x.TableBID WHERE a.id = 1

https://www.eversql.com/kb/Is-a-JOIN-faster-than-a-WHERE-1129923

https://www.eversql.com/kb/Is-a-JOIN-faster-than-a-WHERE-1129923
[Solved] Is a JOIN faster than a WHERE? – eversql.com
The optimization process and recommendations: Avoid Selecting Unnecessary Columns (query line: 2): Avoid selecting all columns with the ‘*’ wildcard, unless you intend to use them all.Selecting redundant columns may result in unnecessary performance degradation. lesoutrali bot