Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
651 views
in Technique[技术] by (71.8m points)

mysql - Create an inline SQL table on the fly (for an excluding left join)

Let's assume the following:

Table A

id | value
----------
1   | red
2   | orange
5   | yellow
10  | green
11  | blue
12  | indigo
20  | violet

I have a list of id's (10, 11, 12, 13, 14) that can be used to look up id's in this table. This list of id's is generated in my frontend.

Using purely SQL, I need to select the id's from this list (10, 11, 12, 13, 14) that do not have entries in Table A (joining on the 'id' column). The result should be the resultset of id's 13 and 14.

How can I accomplish this using only SQL? (Also, I'd like to avoid using a stored procedure if possible)

The only approach I can think of is something that would create an inline SQL table on the fly to temporarily hold my list of id's. However, I have no idea how to do this. Is this possible? Is there a better way?

Thanks! :)

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

You can do this from SQL Server 2008 onwards using a table value constructor.

SELECT * FROM (
   VALUES(1, 'red'),
         (2, 'orange'),
         (5, 'yellow'),
         (10, 'green'),
         (11, 'blue'),
         (12, 'indigo'),
         (20, 'violet'))
   AS Colors(Id, Value)

More information here: Table Value Constructor


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...