I have a website where visitors can leave comments. I want to add the ability to answer comments (i.e. nested comments).
I am tracking clicks over three time periods: the past day, past week and past month. To do this, I have three tables:
I have a table, Sheet1$ that contains 616 records.I have another table, Rates$ that contains 47880 records.Rates contains a response rate for a given record in the sheet for 90 days from a mailing dat
I don\'t know what our Systems team did to mysql. But one of my jsp pages takes about 15 seconds to load. It took only 1 second before upgrade.
This question is theoretical as well as开发者_StackOverflow practical.Any results indicating useful resources on optimizing queries will be appreciated.
I have problem with ORDER BY clause. When I remove ORDER BY in following query, query is finished in 0.004 seconds.
Query: SELECT A.USER_ID, A.ROLE_ID, C.SUBGROUP, MAX(A.STATUS_ID) FROM USER_ROLE A, USER B, ROLE C WHERE A.ROLE_ID = C.ROLE_ID
At my work I have several tables with over 200,000 rows of data. I have to set-up some queries that look over 15,000+ at a time so some开发者_StackOverflow中文版times I get this error:
I am executing a mysql SELECT statement which takes 30 seconds to run the first time, but then just takes .2 all times after that.
query: SELECT u.deviceID, u.userName, u.contactNo, u.rating FROM User u INNER JOIN TaxiQuery t ON u.deviceID = t.seat1
加载中,请稍侯......