Best match query Post: 302981364

Sponsored Content

Top Forums Programming Best match query Post 302981364 by stomp on Sunday 11th of September 2016 11:11:45 AM

09-11-2016

Registered User

Some comments:

If you try to write MySQL-Functions, I suggest starting from a very minimal function and extend bit by bit and checking if the results are as expected at every step. So you can catch up for single syntax/programming errors which is easier than to be faced with all of them at once
The mysql function syntax seems to me a bit limited in comparison with every real programming language, so I myself would never write anything but really needed snippets(if at all) as mysql functions.
In did not review your code in whole. But as you saw from my small 20 Line MySQL-Function: It already used 6 Seconds to complete, saying which huge amount of computing resources it needed. E. g. it was a very inefficient way to get it done. When I look at your code, you perform a lot of queries which should be all be very fast though. But I just wanted to note that some queries with big data sets can very quickly create huge loads of computing resources needed to get it done.
In Backup MySQL-Functions are not saved by default with the mysqldump command. You need to keep that in mind and
1. change your backup procedure, to have them included -or-
2. tell your system administrator to have that done in case you are not responsible for backup -or-
3. save your functions as textfiles outside the mysql database to be sure to have them backupped up

...and since my previous snippets where a whole lot more than you wanted, this search can be done very quick here.

UPDATE

Mmh. I detected that my solutions were not exactly what you wanted. But it should help nevertheless.

Last edited by stomp; 09-11-2016 at 12:54 PM..

This User Gave Thanks to stomp For This Post:

stomp

View Public Profile for stomp

Find all posts by stomp

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

add the output of a query to a variable to be used in another query

I would like to use the result of a query in another query. How do I redirect/add the output to another variable? $result = odbc_exec($connect, $query); while ($row = odbc_fetch_array($result)) { echo $row,"\n"; } odbc_close($connect); ?> This will output hostnames: host1...

2. UNIX and Linux Applications

mysql query all entries which 'dont' match

I am trying to query a list of hosts and extract all entries which 'dont' match. SELECT LOGS.host, GOODLIST.host FROM LOGS,db.GOODLIST WHERE (LOGS.host <> GOODLIST.host)When I use this query, it is very very slow. Matching the host with the GOODLIST.host works great and fast but when I use <>...

3. Shell Programming and Scripting

Query Oracle tables and return values to shell script that calls the query

Hi, I have a requirement as below which needs to be done viz UNIX shell script (1) I have to connect to an Oracle database (2) Exexute "SELECT field_status from table 1" query on one of the tables. (3) Based on the result that I get from point (2), I have to update another table in the...

4. Programming

sql query to match condition from other table (time sensitive)

I know little SQL and could really use a hand here. I need to get the fields last_name, first_name and email from the table users and only if the entery with the same pkey in the table addresses, in the city column is Seattle. So if the city in the addresses table is Seattle, go to the table...

5. Shell Programming and Scripting

Shell Script to execute Oracle query taking input from a file to form query

Hi, I need to query Oracle database for 100 users. I have these 100 users in a file. I need a shell script which would read this User file (one user at a time) & query database. For instance: USER CITY --------- ---------- A CITY_A B CITY_B C ...

6. Shell Programming and Scripting

Match pattern1 in file, match pattern2, substitute value1 in line

not getting anywhere with this an xml file contains multiple clients set up with same tags, different values. I need to parse the file for client foo, and change the value of tag "64bit" from false to true. cat clients.xml <Client type"FIX"> <ClientName>foo</ClientName>...

7. Shell Programming and Scripting

Request: How to Parse dynamic SQL query to pad extra columns to match the fixed number of columns

Hello All, I have a requirement in which i will be given a sql query as input in a file with dynamic number of columns. For example some times i will get 5 columns, some times 8 columns etc up to 20 columns. So my requirement is to generate a output query which will have 20 columns all the...

8. Shell Programming and Scripting

awk to update file based on partial match in field1 and exact match in field2

I am trying to create a cronjob that will run on startup that will look at a list.txt file to see if there is a later version of a database using database.txt as the source. The matching lines are written to output. $1 in database.txt will be in list.txt as a partial match. $2 of database.txt...

9. Shell Programming and Scripting

awk to print match or non-match and select fields/patterns for non-matches

In the awk below I am trying to output those lines that Match between file1 and file2, those Missing in file1, and those missing in file2. Using each $1,$2,$4,$5 value as a key to match on, that is if those 4 fields are found in both files the match, but if those 4 fields are not found then missing...

10. UNIX for Beginners Questions & Answers

Data match 2 files based on first 2 columns matching only and join if match

Hi, i have 2 files , the data i need to match is in masterfile and i need to pull out column 3 from master if column 1 and 2 match and output entire row to new file I have tried with join and awk and i keep getting blank outputs or same file is there an easier way than what i am...

LEARN ABOUT DEBIAN

cvm-mysql

cvm-mysql(8)						      System Manager's Manual						      cvm-mysql(8)

NAME

       cvm-mysql - MySQL module

SYNOPSIS

       cvm-mysql

CREDENTIALS

       Pass phrase

DESCRIPTION

       This module queries a MySQL database for the account name, compares the stored pass phrase with the given one using crypt(3).

CONFIGURATION VARIABLES

       CVM_MYSQL_DEFAULT_FILE
	      The  full  path of the defaults file to read if the following variable is set.  If not set, the file $HOME/.my.cnf will be read (the
	      MySQL default).

       CVM_MYSQL_DEFAULT_GROUP
	      If set, the module will read connection default options from the named group in the defaults file as above

       CVM_MYSQL_HOST
	      The hostname or IP of the MySQL server.  If not set, a connection to the local host is assumed.

       CVM_MYSQL_USER
	      The MySQL login ID to connect as.  If not set, the invoking user is assumed.

       CVM_MYSQL_PASS
	      The password for the above user.

       CVM_MYSQL_DB
	      The database name, must be set.

       CVM_MYSQL_PORT
	      The port number for the TCP/IP connection (only used if the server is not local).

       CVM_MYSQL_POSTQ (optional)
	      The SQL query to execute after the credentials have been validated, see cvm-sql(7).

       CVM_MYSQL_PWCMP (optional)
	      The password comparison module to use.

       CVM_MYSQL_SOCKET
	      The path to the socket that should be used for connections to a local server.

       CVM_MYSQL_QUERY (optional)
	      The SQL query to issue to retrieve the row containing the account information from the database, see cvm-sql(7).

SEE ALSO

       cvm-sql(7), cvm-pgsql(8), cvm-pwfile(8), cvm-qmail(8), cvm-unix(8), cvm-vmailmgr(8),  cvm-benchclient(8),  cvm-checkpassword(8),  cvm-test-
       client(8)

	http://untroubled.org/pwcmp/pwcmp.html
	http://untroubled.org/cvm/cvm.html

																      cvm-mysql(8)