Quick Answer: Which Is Faster Where Or Having?

Can I start sentence with having?

So, can we start a sentence with ‘Having’ and ‘Having got’.

Yes, it’s both correct and common to start a sentence with the ‘ing’ form of a verb, including the verb ‘have’.

The verb ‘have’ does many jobs in English..

Will or will be grammar?

Will is used for a normal future sentence. Will is also stand for Desire or Willing. … The difference between will or will be is that, Will be is used for future continuous form of a sentence.

What is the difference between where and having?

To summarize the difference between WHERE and HAVING: WHERE is used to filter records before any groupings take place. HAVING is used to filter values after they have been groups. Only columns or expressions in the group can be included in the HAVING clause’s conditions…

Where vs vs join performance?

“Is there a performance difference between putting the JOIN conditions in the ON clause or the WHERE clause in MySQL?” No, there’s no difference. The following queries are algebraically equivalent inside MySQL and will have the same execution plan.

Are left joins expensive?

It’s because SQL Server wants to do a hash match for the INNER JOIN , but does nested loops for the LEFT JOIN ; the former is normally much faster, but since the number of rows is so tiny and there’s no index to use, the hashing operation turns out to be the most expensive part of the query.

Was having is correct?

You don’t use the word have as a main verb in the progressive to talk about things you own or possess. So the correct sentence is: … However, you can use it in the progressive if you talk about actions, events, or activities as follows: He’s having a chat with Joan.

Is it were having or had?

So, the verb tenses match. Was is the past tense of “to be”, and had is the past tense of “to have”. I’d suggest I was having dinner would be more idiomatic. … If one is providing the entertainment, though, you would say giving a dinner, giving a luncheon.

Is have to have correct grammar?

Yes, “to have to have” (as in, “They have to have it finished by noon tomorrow” or “Sheila says that in order to meet her professor’s requirements she has to have a specific edition of the book”) is a perfectly proper, grammatically correct verb phrase. There is nothing whatsoever wrong with it.

Will having or will be having?

Member Emeritus Yes, “will have” is the simple future. But “will be having” is fine to describe what you’ll be doing next Wednesday. And just “have” is really short for (and understood as) “have on my schedule”.

Where do we use having?

Just like “being,” “having” can act as the subject or object in a sentence. Having is always followed by a noun phrase. We have something. Again, we are talking about this situation or condition of having a big house.

How do I select duplicate rows in SQL?

To select duplicate values, you need to create groups of rows with the same values and then select the groups with counts greater than one. You can achieve that by using GROUP BY and a HAVING clause.

Will have gone grammar?

It basically translates as an action that will be already completed by the time you get to the future. … It sounds more colloquial (in my opinion) to say “I’ll be gone.” But if we are speaking very strictly in terms of grammar, the second option — “By the time you arrive, I’ll have gone.” — is more correct.

Which is faster joins or subqueries?

The advantage of a join includes that it executes faster. The retrieval time of the query using joins almost always will be faster than that of a subquery. By using joins, you can maximize the calculation burden on the database i.e., instead of multiple queries using one join query.

How do you ask tomorrow the class is there or not?

“Will classes be there tomorrow?” questions the location of the classes, not if they will happen or not. For example, if your teacher has been mentioning a class-visit to a local park, you could ask “Will classes be there [meaning the park] tomorrow”. Will there be classes tomorrow is the correct one to use.

Why exists is faster than in SQL Server?

The EXISTS clause is much faster than IN when the subquery results is very large. Conversely, the IN clause is faster than EXISTS when the subquery results is very small. Also, the IN clause can’t compare anything with NULL values, but the EXISTS clause can compare everything with NULLs.

Can we use where and having clause together?

A query can contain both a WHERE clause and a HAVING clause. … The HAVING clause is then applied to the rows in the result set. Only the groups that meet the HAVING conditions appear in the query output. You can apply a HAVING clause only to columns that also appear in the GROUP BY clause or in an aggregate function.

Is Join faster than two queries?

Try running some database statistics against both the JOIN and the multiple SELECTS. See if in your environment the JOIN is faster/slower than the SELECT. In my experience I have found it’s usually faster to run several queries, especially when retrieving large data sets.

Which join is faster in SQL?

Well, in general INNER JOIN will be faster because it only returns the rows matched in all joined tables based on the joined column. But LEFT JOIN will return all rows from a table specified LEFT and all matching rows from a table specified RIGHT.