MYSQL updating data from other table

Posted by atif089 on Stack Overflow See other posts from Stack Overflow or by atif089
Published on 2010-04-20T14:38:24Z Indexed on 2010/04/20 14:43 UTC
Read the original article Hit count: 240

Filed under:

mysql

|

tables

|

update

Hi,

I have two tables like of this structure

content (content_id, content_type, user_id, time, comment_count)

comments (comment_id, content_id, userid, comment, comment_time)

What I wold like to do is update the comments_count field with sum of comments i.e COUNT(content_id) from the comments table.

I am not able to figure out the right syntax

Thanks

© Stack Overflow or respective owner

Related posts about mysql

How to remove MySQL completely with config and library files on ubuntu 12.04 gnome 3.0

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
I tried everything till now: sudo apt-get remove mysql-server mysql-client mysql-common sudo apt-get purge mysql-server mysql-client mysql-common sudo apt-get autoremove and even more commands... But whenever I am trying to locate mysql. I get a no. of files related to mysql command: shell>>… >>> More
mysql: Cannot load from mysql.proc. The table is probably corrupted

as seen on Server Fault - Search for 'Server Fault'
Mysql was started: /usr/bin/mysqld_safe --datadir=/srv/mysql/myDB --log-error=/srv/mysql/logs/mysqld-myDB.log --pid-file=/srv/mysql/pids/mysqld-myDB.pid --user=mysql --socket=/srv/mysql/sockets/mysql-myDB.sock --port=3700 but when I'm trying to do something: ERROR 1548 (HY000) at line 1: Cannot… >>> More
mysql: Bind on unix socket: Permission denied

as seen on Server Fault - Search for 'Server Fault'
Can't start mysql with: sudo /usr/bin/mysqld_safe --datadir=/srv/mysql/myDB --log-error=/srv/mysql/logs/mysqld-myDB.log --pid-file=/srv/mysql/pids/mysqld-myDB.pid --user=mysql --socket=/srv/mysql/sockets/mysql-myDB.sock --port=3700 120222 13:40:48 mysqld_safe Starting mysqld daemon with databases… >>> More
Why is there a /etc/init.d/mysql file on this Slackware machine? How could it have gotten there?

as seen on Server Fault - Search for 'Server Fault'
A client of my IT-consulting service owns a web-development shop. He's been having problems with a Slackware 12.0 server running MySQL 5.0.67. The machine was set up by the client's sysadmin, who left on bad terms. My client no longer employs a sysadmin. As far as I can tell, the only copy of MySQL… >>> More
MySQL – Learning MySQL Online in 6 Hours – MySQL Fundamentals in 320 Minutes

as seen on SQL Authority - Search for 'SQL Authority'
MySQL is one of the most popular database language and I have been recently working with it a lot. Data have no barrier and every database have their own place. I have been working with MySQL for quite a while and just like SQL Server, I often find lots of people asking me if I have a tutorial which… >>> More

Related posts about tables

Microsoft SQL Server 2005 Inserting into tables from child procedure which returned multiple tables

as seen on Stack Overflow - Search for 'Stack Overflow'
I've got a child procedure which returns more than table. child: PROCEDURE KevinGetTwoTables AS BEGIN SELECT 'ABC' Alpha, '123' Numeric SELECT 'BBB' Alpha, '123' Numeric1, '555' Numeric2 END example: PROCEDURE KevinTesting AS BEGIN DECLARE @Table1 TABLE ( Alpha varchar(50)… >>> More
javascript to print all tables and individual tables

as seen on Stack Overflow - Search for 'Stack Overflow'
I am retrieving values from a database and displaying it a table using php. Each table is stored inside a div tag. <div id="print"> table content 1 </div> <div id="print"> table content 2 </div> .................. Can some one please suggest a javascript where i can get… >>> More
retrieve data from multiple tables referencing some tables in mysql

as seen on Stack Overflow - Search for 'Stack Overflow'
i have 10 tables have innoDB engine 1. one is state_table which attributes are state_id and state_name 2. another table city_table which attributes are city_id and city_name 3. one more table permit_table which attribute is p_id above city_id,state_id and permit_id is references to rest of 7… >>> More
retrive data from multiple tables referencing some tables in mysql

as seen on Stack Overflow - Search for 'Stack Overflow'
i have 10 tables have innoDB engine 1. one is state_table which attributes are state_id and state_name 2. another table city_table which attributes are city_id and city_name 3. one more table permit_table which attribute is p_id above city_id,state_id and permit_id is references to rest of 7… >>> More
Chained Hash Tables vs. Open-Addressed Hash Tables

as seen on Stack Overflow - Search for 'Stack Overflow'
Can somebody explain the main differences between (advantages / disadvantages) the two implementations? For a library, what implementation is recommended? >>> More