Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: LEFT JOIN issue in Mysql
Top Forums Programming LEFT JOIN issue in Mysql Post 302594690 by figaro on Wednesday 1st of February 2012 03:21:45 AM
Old 02-01-2012
LEFT JOIN issue in Mysql
I have a data table as follows:
Code:
mysql> select * from validations where source = "a03";
+------------+-------+--------+
| date       | price | source |
+------------+-------+--------+
| 2001-01-03 |    80 | a03    |
| 2001-01-04 |    82 | a03    |
| 2001-01-05 |    84 | a03    |
| 2001-01-06 |    86 | a03    |
| 2001-01-07 |    88 | a03    |
| 2001-01-08 |    90 | a03    |
+------------+-------+--------+

And some dates as follows:
Code:
mysql> select * from dates;
+------------+
| date       |
+------------+
| 2001-01-01 |
| 2001-01-02 |
| 2001-01-03 |
| 2001-01-04 |
| 2001-01-05 |
| 2001-01-06 |
| 2001-01-07 |
+------------+

In a left join the result is the following:
Code:
mysql> SELECT dt.date, v.price, v.source FROM dates dt LEFT JOIN validations v ON dt.date = v.date WHERE source = "a03";
+------------+-------+--------+
| date       | price | source |
+------------+-------+--------+
| 2001-01-03 |    80 | a03    |
| 2001-01-04 |    82 | a03    |
| 2001-01-05 |    84 | a03    |
| 2001-01-06 |    86 | a03    |
| 2001-01-07 |    88 | a03    |
+------------+-------+--------+

Why are the dates first and second of january not returned?
 

9 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Left join on files using awk

nawk 'NR==FNR{a;next} {if($1 in a) print $1,"Found" else print}' OFS="," File_B File_A The above code is not working help is appreciated (6 Replies)
Discussion started by: pinnacle
6 Replies

2. Programming

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... (0 Replies)
Discussion started by: robbiezr
0 Replies

3. Web Development

MySQL Join

Hey! I hope to find someone who can help me with a join question. I just can't figure it out. I have (among others) three tables in the database "CastControl". They are named "cc_users", "cc_plan" and "cc_servers". In cc_users, (among others) is a row named "username" and another named... (1 Reply)
Discussion started by: noratx
1 Replies

4. Solaris

No Space Left - Memory/Swap issue

:wall:I'm having a bit of a problem with Solaris 10u8 and one of our applications requesting memory and being told, "no space left". The break down: 24GB Physical Memory 8GB swap at the time of occurance, here's what a memory breakdown looks like: Page Summary Pages ... (21 Replies)
Discussion started by: aychbee45
21 Replies

5. Shell Programming and Scripting

Left Join in Unix based on Key?

So I have 2 files: File 1: 111,Mike,Stipe 222,Peter,Buck 333,Mike,Mills File 2: 222,Mr,Bono 444,Mr,Edge I want output to be below, where 222 records joined and all none joined records still in output 111,Mike,Stipe 222,Peter,Buck,Mr,Bono 333,Mike,Mills 444,Mr,Edge (4 Replies)
Discussion started by: stack
4 Replies

6. Programming

MySQL join four tables!

Hello; I want merge four MySQL tables to get the intersection that have a common field for all of them. Join two tables is fine to me, but my this case is different from common situations and there are not very many discussions about it. Can anybody give me some idea? Thanks a lot! Here is part... (8 Replies)
Discussion started by: yifangt
8 Replies

7. Shell Programming and Scripting

left join using awk

Hi guys, I need to use awk to join 2 files file_1 A 001 B 002 C 003 file_2 A XX1 B XX2 output desired A 001 XX1 B 002 missing C 003 XX2 thank you! (2 Replies)
Discussion started by: g1org1o
2 Replies

8. Shell Programming and Scripting

left join using awk

Hi guys, I need AWK to merge the following 2 files: file1 1 a 1 1 2 b 2 2 3 c 3 3 4 d 4 4 file2 a a/a c/c a/c c/c a/a c/t c c/t c/c a/t g/g c/c c/t desired output: 1 a 1 1 a/a c/c a/c c/c a/a c/t 2 b 2 2 x x x x x x 3 c 3 3 c/t c/c a/t g/g c/c c/t 4 d 4 4 x x x x x x (2 Replies)
Discussion started by: g1org1o
2 Replies

9. 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

LEARN ABOUT REDHAT

ppmtosixel

ppmtosixel(1)						      General Commands Manual						     ppmtosixel(1)

NAME

       ppmtosixel - convert a portable pixmap into DEC sixel format

SYNOPSIS

       ppmtosixel [-raw] [-margin] [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as input.  Produces sixel commands (SIX) as output.	The output is formatted for color printing, e.g. for a DEC
       LJ250 color inkjet printer.

       If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled.  A printer control header and a color assignment table
       begin the SIX file.  Image data is written in a compressed format by default.  A printer control footer ends the image file.

OPTIONS

       -raw   If  specified,  each  pixel  will  be explicitly described in the image file.  If -raw is not specified, output will default to com-
	      pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands.  A raw file is often an order	of  magni-
	      tude larger than a compressed file and prints much slower.

       -margin
	      If  -margin  is not specified, the image will be start at the left margin (of the window, paper, or whatever).  If -margin is speci-
	      fied, a 1.5 inch left margin will offset the image.

PRINTING

       Generally, sixel files must reach the printer unfiltered.  Use the lpr -x option or cat filename > /dev/tty0?.

BUGS

       Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion.  If the original PPM maxval was
       greater	than  100,  rescaling  also reduces the image depth.  While the actual RGB values from the ppm file are more or less retained, the
       color palette of the LJ250 may not match the colors on your screen.  This seems to be a printer limitation.

SEE ALSO

       ppm(5)

AUTHOR

       Copyright (C) 1991 by Rick Vinci.

								   26 April 1991						     ppmtosixel(1)
All times are GMT -4. The time now is 09:36 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy