sql-limit | 易学教程

PostgreSQL equivalent for TOP n WITH TIES: LIMIT “with ties”?

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I'm looking for something similar this in SQL Server: SELECT TOP n WITH TIES FROM tablename I know about LIMIT in PostgreSQL, but does the equivalent of the above exist? I'm just curious as it would save an extra query each time for me. If I have a table Numbers with attribute nums : {10, 9, 8, 8, 2} . I want to do something like: SELECT nums FROM Numbers ORDER BY nums DESC LIMIT *with ties* 3 It should return {10, 9, 8, 8} because it takes the top 3 plus the extra 8 since it ties the other one. Erwin Brandstetter There is no WITH TIES clause in PostgreSQL like there is in SQL Server . In

MySQL COUNT with LIMIT

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问题 What I want to do is SUM a column, but also COUNT the number of rows it is summing, with a limit of no more than 5 rows. So my query is: SELECT COUNT(*), SUM(score) FROM answers WHERE user=1 LIMIT 5 What I expected back was a COUNT(*) up to 5 (I cant just assume it will always be 5 in my code logic as it could have less than 5 answers), with a sum of the score of the up to 5 rows. Instead what I seem to get back is the total number of matching rows (where user is 1) as the count, and the sum

Is there a way to “limit” the result with ELOQUENT ORM of Laravel?

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Is there a way to "limit" the result with ELOQUENT ORM of Laravel? SELECT * FROM `games` LIMIT 30 , 30 And with Eloquent ? Create a Game model which extends Eloquent and use this: Game::take(30)->skip(30)->get(); take() here will get 30 records and skip() here will offset to 30 records. In recent Laravel versions you can also use: Game::limit(30)->offset(30)->get(); If you're looking to paginate results, use the integrated paginator , it works great! $games = Game::paginate(30); // $games->results = the 30 you asked for // $games->links() = the links to next, previous, etc pages We can use

Is there a way to “limit” the result with ELOQUENT ORM of Laravel?

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问题 Is there a way to \"limit\" the result with ELOQUENT ORM of Laravel? SELECT * FROM `games` LIMIT 30 , 30 And with Eloquent ? 回答1: Create a Game model which extends Eloquent and use this: Game::take(30)->skip(30)->get(); take() here will get 30 records and skip() here will offset to 30 records. In recent Laravel versions you can also use: Game::limit(30)->offset(30)->get(); 回答2: If you're looking to paginate results, use the integrated paginator, it works great! $games = Game::paginate(30); //

PostgreSQL equivalent for TOP n WITH TIES: LIMIT “with ties”?

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问题 I\'m looking for something similar this in SQL Server: SELECT TOP n WITH TIES FROM tablename I know about LIMIT in PostgreSQL, but does the equivalent of the above exist? I\'m just curious as it would save an extra query each time for me. If I have a table Numbers with attribute nums : {10, 9, 8, 8, 2} . I want to do something like: SELECT nums FROM Numbers ORDER BY nums DESC LIMIT *with ties* 3 It should return {10, 9, 8, 8} because it takes the top 3 plus the extra 8 since it ties the other

MySQL offset infinite rows

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问题 I would like to construct a query that displays all the results in a table, but is offset by 5 from the start of the table. As far as I can tell, MySQL\'s LIMIT requires a limit as well as an offset. Is there any way to do this? 回答1: From the MySQL Manual on LIMIT: To retrieve all rows from a certain offset up to the end of the result set, you can use some large number for the second parameter. This statement retrieves all rows from the 96th row to the last: SELECT * FROM tbl LIMIT 95,

How does MySQL process ORDER BY and LIMIT in a query?

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问题 I have a query that looks like this: SELECT article FROM table1 ORDER BY publish_date LIMIT 20 How does ORDER BY work? Will it order all records, then get the first 20, or will it get 20 records and order them by the publish_date field? If it\'s the last one, you\'re not guaranteed to really get the most recent 20 articles. 回答1: It will order first, then get the first 20. A database will also process anything in the WHERE clause before ORDER BY . 回答2: The LIMIT clause can be used to constrain

Best way to get result count before LIMIT was applied

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问题 When paging through data that comes from a DB, you need to know how many pages there will be to render the page jump controls. Currently I do that by running the query twice, once wrapped in a count() to determine the total results, and a second time with a limit applied to get back just the results I need for the current page. This seems inefficient. Is there a better way to determine how many results would have been returned before LIMIT was applied? I am using PHP and Postgres. 回答1: Pure