multiple-tables

问题 How to drop multiple tables from one single database at one command. something like, > use test; > drop table a,b,c; where a,b,c are the tables from database test. 回答1: Example: Let's say table A has two children B and C. Then we can use the following syntax to drop all tables. DROP TABLE IF EXISTS B,C,A; This can be placed in the beginning of the script instead of individually dropping each table. 回答2: SET foreign_key_checks = 0; DROP TABLE IF EXISTS a,b,c; SET foreign_key_checks = 1; Then

问题 In continuation with previous question, I need to display score below query does not work Question is here : Question 1 INSERT INTO TblScore (ScoreID, TeamID, MatchID, Score) VALUES (1, 1, 1, 5), (2, 2, 1, 6), (3, 4, 2, 15), (4, 3, 2, 26); Score query does not work $query="SELECT m.MatchID, m.MatchDate, m.Team1ID, m.Team2ID, s.TeamID, s.MatchID, T1.TeamName as TeamName1, T2.TeamName as TeamName2, T1S.Score as Team1Score, T2S.Score as Team2Score FROM TblMatch m JOIN TblTeam T1 ON m.Team1ID =

问题 I have a number of tables with filtered from all the records customer ID's, Last Order Date and that order Total $, Segment Name. Each filter is based on different criteria but, same customer ID can belong two different tables, two different segments. Same ID would have different values in Last Order and Total in . Segments, table names are A, B, C, D. I need to group the records from All the segment tables in a way that there are no duplicate ID's in the set. i.e.: if an ID appears in more

问题 I am not sure why this behaves this way. I need to select few values from two tables based on some criteria which should be clear from the query i tried below. query = @"SELECT n.borrower, a.sum, n.lender FROM Notification AS n, Acknowledgment AS a WHERE n.deleted=@del2 AND n.id IN (SELECT parent_id FROM Acknowledgment WHERE status=@status AND deleted=@del1)"; This returns more rows (12) than expected. I have two tables Notification and Acknowledgment both which have field "sum". When I try

问题 Can anyone advise on how to go about denormalising a fully normalised table? I've not been able to find much on it despite googling. Whenever a record is updated (though not inserted, but lets not worry about that now) in TableA a record is inserted into HistoryOfTableA with the values of the fields which have changed and an associated timestamp when it was carried out. eg. TableA fields: TableA_Id, FieldA, FieldB, FieldC, FieldD.... etc HistoryOfTableA records: HistID, TableA_Id,

问题 I have the following two tables: 1. BList BookingID AdultNo ChildNo BookingDate 2. BHandle BookingID TicketingStatus FinalSellingPrice FinalNett Staff What I want to do is get the distinct Staff with Sum of (SellingPrice) , Sum of (NettPrice) , Profit (Sum of sellingPrice)- Sum of (NettPrice)) , No of Pax which is (AdultNo + ChildNo) and also count the BookingID as No of Bookings WHERE BookingDate >= fromDate AND BookingDate <= toDate AND TicketingStatus='CP' Something that looks like this

问题 I have three query and I would like to have a single one. These is my query: UPDATE tab1 SET a='' WHERE id=3; UPDATE tab2 SET b='' WHERE id=9; UPDATE tab3 SET c='' WHERE id=5; 回答1: You can try below code: UPDATE tab1, tab2, tab3 SET tab1.a = '', tab2.b = '',tab3.c = '' WHERE tab1.id = 3 AND tab2.id = 9 AND tab3.id = 5; UPDATE: As per mentioned by OP, the code not working for Mysql 5.5 , below code added UPDATE tab1 a INNER JOIN tab2 b ON (a.id = b.id) INNER JOIN tab3 c ON (a.id = c.id) SET

问题 I have three query and I would like to have a single one. These is my query: UPDATE tab1 SET a='' WHERE id=3; UPDATE tab2 SET b='' WHERE id=9; UPDATE tab3 SET c='' WHERE id=5; 回答1: You can try below code: UPDATE tab1, tab2, tab3 SET tab1.a = '', tab2.b = '',tab3.c = '' WHERE tab1.id = 3 AND tab2.id = 9 AND tab3.id = 5; UPDATE: As per mentioned by OP, the code not working for Mysql 5.5 , below code added UPDATE tab1 a INNER JOIN tab2 b ON (a.id = b.id) INNER JOIN tab3 c ON (a.id = c.id) SET

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: Foreign key constraint may cause cycles or multiple cascade paths? I am getting the following error while creating the table listed below. Msg 1785, Level 16, State 0, Line 1 Introducing FOREIGN KEY constraint 'FKFacSupervisor' on table 'Faculty' may cause cycles or multiple cascade paths. Specify ON DELETE NO ACTION or ON UPDATE NO ACTION, or modify other FOREIGN KEY constraints. Msg 1750, Level 16, State 0,

问题 I have a problem. I have 4 tables: Invoice_Payment, Invoice, Client, and Calendar Basically, I have the below query, which works well, except, months with no date_due don't return. I.E only months with a date_due will be returned. Note: the calendar table simply lists every day of the year. It contains a single col call date_field Database: http://oberto.co.nz/jInvoice.txt Expected output: my current query, below, will return something like: month total August 5 September 0 October 196