What is the performance of INNER JOIN vs WHERE?

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INNER JOIN vs LEFT JOIN performance in SQL Server

I've created SQL command that use INNER JOIN for 9 tables, anyway this command take a very long time (more than five minutes). So my folk suggest me to change INNER JOIN to LEFT JOIN because the performance of LEFT JOIN is better, at first time its despite what I know. After I changed, the speed of query is significantly improve. I want to know why LEFT JOIN is faster than INNER JOIN? My SQL command look like below: SELECT * FROM A INNER JOIN B ON ... INNER JOIN C ON ... INNER JOIN D and so no...

Answer:

A LEFT JOIN is absolutely not faster than an INNER JOIN. In fact, it's slower; by definition, an outer...

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Other solutions

SQL: Is there a performance gain using one join vs. several?

When designing a database schema, is there a performance gain using a pseudo-key (an auto-incremented key) vs. a natural key that constitutes two or more fields?  In other words, would one join be faster and by how much by percentage over using two joins...

Answer:

This is not premature optimization. Considering your tables primary key and natural vs. pseudo is *not...

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Teradata data type: NUMBER vs. INT/SMALLINT/BYTEINT. Which is better?

With version 14, Teradata finally support NUMBER data type which stores numeric value in ORACLE fashion. Historically, Teradata tends to advocate fixed-length data type, such as INT/BYTEINT/CHAR(n), for better performance. Even its catalog/metadata tables...

Answer:

As stated in question, fixed-length data types are used historically, and lot of enhancements are done...

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Oracle "JOIN ON" vs "NATURAL JOIN"?

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Answer:

Try this: select SECTION_YEAR, SEMESTER, courses.COURSE_CODE, COURSE_NAME, INSTRUCTOR_LAST_NAME, INSTRUCTOR...

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Answer:

This is actually an apples-to-oranges comparison. Render-time-wise, Server Controls will always render...

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How can I compare performance of computers with duo-core chips vs. the older models w/ chips like the Pentium?

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Answer:

It sucks, you have to look it up a bit for the ghz. More buzz crap. [For Dual] They're roughly twice...

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Car Dilemma: Affordable vs. Performance?

I'm looking to buy a first car to keep for the next 5 years or so, and here's my dilema: I'm a big car guy who would love a fast, sporty, affordable car. I was looking seriously at either the Civic Si or VW GTI. Optioned the way I want, the Si would...

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Answer:

It's not worth it, even the Magnaflow catback is only 2.25" piping and so many bends, I didn't...

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