outer-join

问题 Maybe a facepalm for you guys, but as a SQL query newbie, I'm having a syntax issue. Anyone know what's wrong? SELECT * FROM company C OUTER JOIN company_address A ON C.company_id = A.company_id WHERE A.company_id IS NULL Giving the error: #1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'OUTER JOIN company_address A ON C.company_id = A.company_id WHERE A.address_id ' at line 2 回答1: In MySQL you

问题 I have attempted to join/merge/concat two modin.pandas DataFrames and failed. Has anyone been successful in performing this operation? This is the big data modin-project pandas implementation. The source is here: https://github.com/modin-project/modin/blob/master/modin/pandas/dataframe.py and https://github.com/modin-project/modin/blob/master/modin/pandas/concat.py Examples: import modin.pandas as pd vals = pd.DataFrame([1,2,3,4], index=['2018-01-01','2018-01-02','2018-01-03','2018-01-04'],

问题 I would like to ask how to change the OUTER from Informix to HQL query. Currently facing error with unexpected token:outer SQL query: select a.SC_OB_PROFILE_CODE, b.SC_ORIG_SF_GROUP_CODE, f.SC_ORIG_SAC, f.SC_ORIG_FAC,b.SC_PROD_CONT_GROUP_CODE, d.SC_PROD_CONT_CODE, e.GP_CD, a.SC_ORIG_COUNTRY, a.SC_DEST_COUNTRY, a.SC_DEST_SAC, a.SC_DEST_FAC, a.SC_SEND_DOW, a.SC_OB_SORT_CODE, a.ORIG_OB_SORT_CODE, a.TARGET_OB_SORT_CODE, a.SC_TIMESTAMP from SC_OB_TEMP_AUDIT2 a, SC_OB_ALLOCATION b, outer SC_FAC

问题 I have a query like this: select a1.name, b1.info from (select name, id, status from table1 a) as a1 right outer join (select id, info from table2 b) as b1 on (a1.id = b1.id) I only want to include everything where a1.status=1 and since I'm using an outer join, I can't just add a where constraint to table1, because all info from table2 that I want to be excluded will still be there, just without the name. I was thinking something like this: select z1.name, z1.info from ((select name, id,

问题 I have two tables with similar column names and I need to return records from the left table which are not found in the right table? I have a primary key(column) which will help me to compare both tables. Which join is preferred? 回答1: If you are asking for T-SQL then lets look at fundamentals first. There are three types of joins here each with its own set of logical processing phases as: A cross join is simplest of all. It implements only one logical query processing phase, a Cartesian

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 SELECT WO_BreakerRail.ID, indRailType.RailType, indRailType.RailCode, WO_BreakerRail.CreatedPieces, WO_BreakerRail.OutsideSource, WO_BreakerRail.Charged, WO_BreakerRail.Rejected, WO_BreakerRail.RejectedToCrop, WO_BreakerRail.Date FROM indRailType LEFT OUTER JOIN WO_BreakerRail ON indRailType.RailCode = WO_BreakerRail.RailCode AND WO_BreakerRail.Date = @date When this returns, there are NULL values in the Date column where there are no matching rows from WO_BreakerRail. Is there a way to

问题 We have a table called Student . That table has a field called Homeroom , where the value is a room number of the student's homeroom. The value can be null. We have a second table called Staff . That table also has a field called Homeroom to indicate which homeroom the teacher is assigned to. The value can be null. But when the student's Homeroom is null, a Staff record should not be returned. We used to take advantage of the fact that checking two null fields for equality always returns

问题 We have a table called Student . That table has a field called Homeroom , where the value is a room number of the student's homeroom. The value can be null. We have a second table called Staff . That table also has a field called Homeroom to indicate which homeroom the teacher is assigned to. The value can be null. But when the student's Homeroom is null, a Staff record should not be returned. We used to take advantage of the fact that checking two null fields for equality always returns