left-join

问题 Following the my question I have the following tables the first (Range) includes range of values and additional columns: row | From | To | Country .... -----|--------|---------|--------- 1 | 1200 | 1500 | 2 | 2200 | 2700 | 3 | 1700 | 1900 | 4 | 2100 | 2150 | ... The From and To are bigint and are exclusive. The Range table includes 1.8M records. Additional table (Values) contains 2.7M records and looks like: row | Value | More columns.... --------|--------|---------------- 1 | 1777 | 2 | 2122

问题 I have this query: @NamedQuery( name = "org.mygovscot.stars.model.UserNeed.findAll", query = "SELECT un FROM UserNeed un " + "LEFT JOIN FETCH un.services " ) With this mapping from Service to UserNeed: <set name="userNeeds" table="service_userNeed"> <key column="service_id"/> <many-to-many column="userNeed_id" class="UserNeed"/> </set> and this mapping from UserNeed to Service: <set name="services" table="service_userNeed"> <key column="userNeed_id"/> <many-to-many column="service_id" class=

问题 I am new to LINQ. I am using LINQ to Objects (I think) and the way the data is set up I can't directly get to a piece of data I need. This is the general structure of what I NEED to do: FROM Project LEFT OUTER JOIN TechnologySectors LEFT OUTER JOIN SelectedAgencies LEFT OUTER JOIN ProjectStatus JOIN Process I need a single piece of data from Process. So far I have figured out how to do a LEFT OUTER JOIN with LINQ using DefaultIfEmpty() but I cannot figure out out to get Process to JOIN with

问题 When I made a query, first only records with entries in all of the related tables where showing. I was able to change this behavior by changing the join properties (to a left join). I want the same behavior for the form: all of the records should be accessible through the form. However, I don't find a way to change the join-type for forms. How can this be done? 回答1: In your query designer, double click the line that represents the join, it should give you a button called Join Type or

问题 When I made a query, first only records with entries in all of the related tables where showing. I was able to change this behavior by changing the join properties (to a left join). I want the same behavior for the form: all of the records should be accessible through the form. However, I don't find a way to change the join-type for forms. How can this be done? 回答1: In your query designer, double click the line that represents the join, it should give you a button called Join Type or

问题 I have this mysql query: SELECT Files.GUID, Files.Name, Files.Type, Files.Visibility, Files.CreationDate, Files.OwnerUser, Date, BackupsCount FROM Files LEFT JOIN ( SELECT FileGUID, Date, COUNT(*) AS BackupsCount FROM Versions GROUP BY FileGUID ) Versions ON Files.GUID = Versions.FileGUID WHERE Files.ParentFolder = '96251A8B-B2A8-416B-92D7-3509E6A645C7' ORDER BY Files.Type DESC, CreationDate ASC LIMIT 0, 50 I'd like to know how many record this query would return if the LIMIT directive was

问题 It is an intelligent tag base image search system. User adds images with its proper tags in such a table: image (id, title, ...) tag (id, title) /* It doesn't matter who has created the tag*/ imagetag (image_id, tag_id) /* One image may have multiple tags */ User views images and the visits from * those images' tags * are logged in usertagview table. (Note that I've used an INSERT ON DUPLICATE UPDATE query for that purpose.) usertagview (user_id, tag_id, view_count) Now please consider some

问题 It is an intelligent tag base image search system. User adds images with its proper tags in such a table: image (id, title, ...) tag (id, title) /* It doesn't matter who has created the tag*/ imagetag (image_id, tag_id) /* One image may have multiple tags */ User views images and the visits from * those images' tags * are logged in usertagview table. (Note that I've used an INSERT ON DUPLICATE UPDATE query for that purpose.) usertagview (user_id, tag_id, view_count) Now please consider some

问题 I've an old table like this: user> id | name | address | comments And now I've to create an "alias" table to allow some users to have an alias name for some reasons. I've created a new table 'user_alias' like this: user_alias> name | user But now I have a problem due my poor SQL level... How to join both tables to generate something like this: 1 | my_name | my_address | my_comments 1 | my_alias | my_address | my_comments 2 | other_name | other_address | other_comments I mean, I want to make a

问题 I've an old table like this: user> id | name | address | comments And now I've to create an "alias" table to allow some users to have an alias name for some reasons. I've created a new table 'user_alias' like this: user_alias> name | user But now I have a problem due my poor SQL level... How to join both tables to generate something like this: 1 | my_name | my_address | my_comments 1 | my_alias | my_address | my_comments 2 | other_name | other_address | other_comments I mean, I want to make a