sql,multiple join,outer join issue

Thread Tools Search this Thread
Top Forums Programming sql,multiple join,outer join issue
# 1  
Old 06-06-2009
Java sql,multiple join,outer join issue

example sql:

select a.a1,b.b1,c.c1,d.d1,e.e1 
from a 
left outer join b on a.x=b.x
left outer join c on b.y=c.y
left outer join d on d.z=a.z
inner join a.t=e.t

I know how single outer or inner join works in sql.
But I don't really understand when there are multiple of them.
can somebody explain it .
It is better to give a equivalent sql .

Thank you!
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Join, merge, fill NULL the void columns of multiples files like sql "LEFT JOIN" by using awk

Hello, This post is already here but want to do this with another way Merge multiples files with multiples duplicates keys by filling "NULL" the void columns for anothers joinning files file1.csv: 1|abc 1|def 2|ghi 2|jkl 3|mno 3|pqr file2.csv: 1|123|jojo 1|NULL|bibi... (2 Replies)
Discussion started by: yjacknewton
2 Replies

2. Programming

Join 2 SQL queries into one

Dear community, could someone help me to join 2 queries into one? Basically it's the same query with different clauses (please notice the FIELD3 filters and related counters into the subquery): SELECT A.FIELD1,A.FIELD2,A.FIELD3 FROM TABLE A INNER JOIN ( SELECT FIELD1,... (3 Replies)
Discussion started by: Lord Spectre
3 Replies

3. UNIX for Dummies Questions & Answers

UNIX outer join

Hello.. I am trying to join two files of about 7000 records. it looked quite straight forward when i began, but i'm not getting the desired output. here is what i'm trying to do: cat xxx item,So,Mo,Tu aaa,1,1,1 bbb,1,1,4 ccc,1,1,0 ddd,1,1,1 cat yyy item,Tu,We aaa,1,1 bbb,4,0... (7 Replies)
Discussion started by: wanderingmind16
7 Replies

4. UNIX for Dummies Questions & Answers

How to use the the join command to join multiple files by a common column

Hi, I have 20 tab delimited text files that have a common column (column 1). The files are named GSM1.txt through GSM20.txt. Each file has 3 columns (2 other columns in addition to the first common column). I want to write a script to join the files by the first common column so that in the... (5 Replies)
Discussion started by: evelibertine
5 Replies

5. UNIX for Dummies Questions & Answers

issue when using join

dear friends, attached are two sorted files. I want to merge them using key column: Column #2 in first file and column #1 in the second file. I want to show all columns in the merged output file. my code used is: join -a1 -a2 -1 2 -2 1 -o 1.1 1.2 1.3 2.1 uncontrols2_by_ilmn_gene.txt... (4 Replies)
Discussion started by: forevertl
4 Replies

6. Programming

Query to join two tables in SQL

Hi, I have 2 tables. Table1 name map_code data_code id aaa 2732C 3333B 10 bbb 1223F 2545v 11 ccc 12 Table2 name map_code data_code id text_description aaa 2732C 3333B 10 description 1 bbb 1223F 2545v 11 ... (3 Replies)
Discussion started by: vanitham
3 Replies

7. Programming

OUTER join?

Hi, I have a code where it traverses through each record froma table and creates records in another table. I use FOREACH cursor to do this, i'm using another cursor inside the FOREACH to fetch the details of other table. Please suggest me which would be more efficient, as this will run against... (2 Replies)
Discussion started by: dvah
2 Replies

8. UNIX for Dummies Questions & Answers

Join 2 files with multiple columns: awk/grep/join?

Hello, My apologies if this has been posted elsewhere, I have had a look at several threads but I am still confused how to use these functions. I have two files, each with 5 columns: File A: (tab-delimited) PDB CHAIN Start End Fragment 1avq A 171 176 awyfan 1avq A 172 177 wyfany 1c7k A 2 7... (3 Replies)
Discussion started by: InfoSeeker
3 Replies

9. Programming

Oracle: fixing an outer join on subquery...

I have a stored procedure that is failing. The current query behind it is: SELECT DISTINCT <many, many values> FROM table1 LEFT OUTER JOIN table2 ON (table2.key = (select max (table2.key) from table2 where table2.key = table1.key) or ... (0 Replies)
Discussion started by: Elric of Grans
0 Replies

10. Shell Programming and Scripting

join (pls help on join command)

Hi, I am a new learner of join command. Some result really make me confused. Please kindly help me. input: file1: LEO oracle engineer 210375 P.Jones Office Runner ID897 L.Clip Personl Chief ID982 S.Round UNIX admin ID6 file2: Dept2C ID897 6 years Dept5Z ID982 1 year Dept3S ID6 2... (1 Reply)
Discussion started by: summer_cherry
1 Replies
Login or Register to Ask a Question
join(1T)						       Tcl Built-In Commands							  join(1T)


join - Create a string by joining together list elements SYNOPSIS
join list ?joinString? _________________________________________________________________ DESCRIPTION
The list argument must be a valid Tcl list. This command returns the string formed by joining all of the elements of list together with joinString separating each adjacent pair of elements. The joinString argument defaults to a space character. EXAMPLES
Making a comma-separated list: set data {1 2 3 4 5} join $data ", " => 1, 2, 3, 4, 5 Using join to flatten a list by a single level: set data {1 {2 3} 4 {5 {6 7} 8}} join $data => 1 2 3 4 5 {6 7} 8 SEE ALSO
list(1T), lappend(1T), split(1T) KEYWORDS
element, join, list, separator ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +--------------------+-----------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +--------------------+-----------------+ |Availability | SUNWTcl | +--------------------+-----------------+ |Interface Stability | Uncommitted | +--------------------+-----------------+ NOTES
Source for Tcl is available on http://opensolaris.org. Tcl join(1T)

Featured Tech Videos