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Jquery Flexigrid Search Items By Serial Number
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Lookup using Serial NumberSales OrderPurchase Order It is a ASP.Net Question Answer site, specially started to allow visitors of this site ask their doubts and queriesWell it's just an unfortunate thing also that this doesn't make it to ANSI SQL: SELECT COUNT() FROM person; That will surely make debating 1 vs asterisk inside a function a moot pointMore intuitive, you don't count the column, you count the cardinality of the set SELECT person.personid, COUNT(bid.*) FROM person LEFT JOIN bid ON bid.personid = person.personid GROUP BY person.personid /* COUNT(1) is a mistake on queries like below, this will always return at least 1 bid belonging to person, even that person don't have any bidsWednesday, April 28, 2010 Debunking the myth that COUNT('Dracula') is faster than COUNT(*) Ok, that was an attempt at humor ;-) How to debunk the myth that COUNT(1) is faster than COUNT(*) ? The most simple mistaken assumption is that the asterisk sign makes the RDBMS read all the columns
First, let's check if there's an ROI for using an extra field for sorting our list: create table ytemp(Col int, IsColNull int) INSERT INTO ytemp VALUES(1,0) INSERT INTO ytemp VALUES(5,0) INSERT INTO ytemp VALUES(4,0) INSERT INTO ytemp VALUES(NULL,1) INSERT INTO ytemp VALUES(3,0) INSERT INTO ytemp VALUES(6,0) INSERT INTO ytemp VALUES(NULL,1) INSERT INTO ytemp VALUES(9999999,0) INSERT INTO ytemp VALUES(2,0) Then let's create index on both xtemp and ytemp create index ixxtemp on xtemp(Col) create index ixytemp on ytemp(IsColNull, Col) Now let's compare their performance relative to each otherI Agree to the Terms and Conditions of Use There may be numerous items on file having the same serial numberjquery search flexigrid shareimprove this question asked Dec 21 '15 at 13:48 Harvinder 1117 add a comment 1 Answer 1 active oldest votes up vote 0 down vote accepted Since I did not find a solution for the problem the way I was hoping for, I went around the problem using a different approachSELECT COUNT(cat) FROM cats .we will not need COUNT(*) (and COUNT(1) for that matter) in SQL language, but as RDBMS don't have an AI to infer that the entity(cat) you want to count is the singular form of the cats table, this didn't make it into the final ANSI SQL spec Second point, a compromise, if this language construct permits counting the table name directlyThe comment is now awaiting moderationUntil Sql Server supported NULLS LAST, we can use the extra field approach to speed up our query that needs to put nulls lastThough some RDBMS already has a construct for putting nulls at the end of the sorted list, Sql Server 2008 still hasn'tThursday, April 1, 2010 My stackoverflow answer on: Check if string is a rotation of other string Found a curious puzzle on stackoverflow, how to check if the string is a rotation of another stringFollow ASPSnippets Follow ASPSnippets Name Required Email Required Invalid Email Address Comment Required Security code: Required Invalid security code
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by Faxazell on 2017-04-10 04:01:01
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