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How to do 3 table JOIN in UPDATE query?
...
the answer is yes you can
try it like that
UPDATE TABLE_A a
JOIN TABLE_B b ON a.join_col = b.join_col AND a.column_a = b.column_b
JOIN TABLE_C c ON [condition]
SET a.column_c = a.column_c + 1
EDIT:
For general Update join :
UPDATE TABLEA a
JOIN TABLEB b ...
What is a proper naming convention for MySQL FKs?
...tically.
In any case, this is the convention that I use:
fk_[referencing table name]_[referenced table name]_[referencing field name]
Example:
CREATE TABLE users(
user_id int,
name varchar(100)
);
CREATE TABLE messages(
message_id int,
user_id int
);
ALTER TABLE me...
How do you create a read-only user in PostgreSQL?
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Grant usage/select to a single table
If you only grant CONNECT to a database, the user can connect but has no other privileges. You have to grant USAGE on namespaces (schemas) and SELECT on tables and views individually like so:
GRANT CONNECT ON DATABASE...
Equal sized table cells to fill the entire width of the containing table
...th relative sizing) to make a row of cells stretch the entire width of the table within which it is contained?
3 Answers
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MySQL, update multiple tables with one query
I have a function that updates three tables, but I use three queries to perform this. I wish to use a more convenient approach for good practice.
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Drop a temporary table if it exists
I have two lines of code in SQL that create two tables on the fly, i need to do something like
3 Answers
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Query to count the number of tables I have in MySQL
I am growing the number of tables I have and I am sometimes curious just to do a quick command line query to count the number of tables in my database. Is that possible? If so, what is the query?
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Is there a MySQL option/feature to track history of changes to records?
...e changes to the data - who did what and when?", you can usually use audit tables (as per the trigger example Keethanjan posted). I'm not a huge fan of triggers, but it has the great benefit of being relatively painless to implement - your existing code doesn't need to know about the triggers and au...
Table fixed header and scrollable body
I am trying to make a table with fixed header and a scrollable content using the bootstrap 3 table.
Unfortunately the solutions I have found does not work with bootstrap or mess up the style.
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Cannot add or update a child row: a foreign key constraint fails
table 1
24 Answers
24
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