multiple-tables

问题 I have a full text catalog with two tables in it. tableA has 4 columns (a1, a2, a3, a4) of wich 3 are indexed in the catalog, a2,a3,a4. a1 is the primary key. tableB has 3 columns (b1, b2, b3, b4), two of which are indexed in the catalog, b3 and b4. b1 is the PK of this table, b2 is the FK to tableA. I want to do something like SELECT *, (ftTableA.[RANK] + ftTableB.[RANK]) AS total_rank FROM tableA INNER JOIN tableB ON tableA.a1=tableB.b2 INNER JOIN FREETEXTTABLE(tableA, (a2,a3,a4), 'search

问题 I have three activities in my application with following names: Activity #1 Activity #2 Activity Final Also for each activity, I have a table with following names: Table #1 Table #2 Table Final Default value of Qty column is "0" and users will change it at run-time. I've created Table#1 and Table#2 and they work fine. I just don't know how can I add rows of Table#1 and Table#2 where "Qty" is bigger than "0" into Table Final . Note: id column of each tables is PRIMARY KEY AUTOINCREMENT 回答1:

问题 I have problems to use multiple database tables what I have: Input:User (table User) Inputfeld:Email(table User) Input:Bookingnumber(table Bookingnumber) using only inputfields form "user" works, adding bookingnumber from other table throws this error: Invalid target for Validator [shuttleservice.form.validator.UserFormValidator@1588512]: shuttleservice.form.model.Bookingnumber@18d7616 the problem is simmilar to How insert values to multiple tables using spring and hibernate and Invalid

问题 I was shown the ease that one can make a view from multiple tables, GROUPing BY an id of one of the tables in xception's awesome answer here: CREATE VIEW WHERE SELECTid = VIEWrowID Is there any way to do that in MS? Everywhere, I've read says "no", but no page gives an alternative. I don't need the counts or anything, just multiple columns from multiple tables GROUPed BY(?) a single column on one table. Thanks a lot in advance! EXAMPLE Thank-you for responding. For the view's SELECT: SELECT

问题 i am having a table with 3 col. viz id,profile_id,plugin_id .there can be more than 1 plugins associated with a single profile now how can i fetch from the database all the plugins associated with a profile_id which comes from the session variable defined in the login page when I try to apply the query for the same it returns the data with the plugin_id of the last record the query is as follows SqlCommand cmd1 = new SqlCommand( "select plugin_id from profiles_plugins where profile_id=" +

问题 I have 3 Tables: Assuming "2019-07-19" is the (Current Date) 1.Inventory: ___________________________________________________ |ID| TransactionDate | ItemID | ItemName |Quantity| +-------------------------------------------------+ |1 |2019-07-18 | 1 |Lemon |100 | +-------------------------------------------------+ |2 |2019-07-19 | 2 |Sugar |100 | +-------------------------------------------------+ |3 |2019-07-19 | 2 |Sugar |100 | +-------------------------------------------------+ |4 |2019-07

问题 I need to be able to do a search on multiple tables and return all parts that are similar to the searched term. My problem is that the tables have varying amounts of columns. They do have columns with similar names though. First the PHP checks the "productnumber" table to find all parts with the similar part number. Then it searches through each table to find a matching number. Right now if a similar part is found in the Components table, it will not display any parts found from Adapters or

问题 I am using play 2.3.8 framework to create an API and access mariaDB. When I ran the query on mariaDB console, it works OK but when I run it from play I get error that the field RECEPTORS.r_name is not available which is not true. My code is package models.dao import anorm._ import models.Profile import play.api.db.DB import play.api.Play.current object ProfileDAO { def index(r_name: String): List[Profile] = { DB.withConnection { implicit c => val results = SQL( """ | SELECT `RECEPTORS.r_name`

问题 I am trying to write a query for a search. I have a meta table with columns: ID | meta_key | meta_value I want to pull a search like the following: SELECT ID FROM meta_table WHERE meta_key = 'title' AND meta_value = 'searchword' However, the complication is that I want to pull this from multiple sets of (multiple meta_keys and multiple meta_values ) if that makes sense. Here is one of the generated queries: SELECT name_table_dan.ID FROM (SELECT user_id as ID FROM wp_usermeta WHERE (meta_key =

问题 I have two rather large databases (+1 million rows each). Both tables have the same structure. How can I check if each value in a column is unique across both tables? Is there a SELECT COUNT(DISTINCT col ) FROM tbl type of query that will consider BOTH tables? Thanks! 回答1: You can UNION two full sets in a subquery and then select DISTINCT col from that. Something like: SELECT DISTINCT col FROM (SELECT * FROM tbl1 UNION ALL SELECT * FROM tbl2) 回答2: You can use UNION ALL statement. It doesn't