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Full Discussion: MySQL join four tables!
Top Forums Programming MySQL join four tables! Post 302592752 by yifangt on Tuesday 24th of January 2012 06:04:28 PM
Old 01-24-2012
What I wanted is to pick up all rows of the three tables (B, C & D) by the common key from col1 of TableA, i.e. A1 ~ A6, if B, C & D share any key of each col2 of B, C & D. The 14 rows output seems to be correct, but with exhaust combination of the four tables.
The fact for this study is to pick up all the common genes of the three organisms with Arabidopsis (model plant) as the reference(key).
At first I was thinking about the technique part to retrieve common rows of four tables (3 tables at least). Now I need to think it over after Tyler's code for my purpose, as I did not take the redundant items (key) in B, C & D although items of col1 in TableA are unique.
Thank you anyway.
 

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DROP 
TABLE(7) SQL Commands DROP TABLE(7) NAME
DROP TABLE - remove a table SYNOPSIS
DROP TABLE [ IF EXISTS ] name [, ...] [ CASCADE | RESTRICT ] DESCRIPTION
DROP TABLE removes tables from the database. Only its owner can drop a table. To empty a table of rows without destroying the table, use DELETE [delete(7)] or TRUNCATE [truncate(7)]. DROP TABLE always removes any indexes, rules, triggers, and constraints that exist for the target table. However, to drop a table that is referenced by a view or a foreign-key constraint of another table, CASCADE must be specified. (CASCADE will remove a dependent view entirely, but in the foreign-key case it will only remove the foreign-key constraint, not the other table entirely.) PARAMETERS
IF EXISTS Do not throw an error if the table does not exist. A notice is issued in this case. name The name (optionally schema-qualified) of the table to drop. CASCADE Automatically drop objects that depend on the table (such as views). RESTRICT Refuse to drop the table if any objects depend on it. This is the default. EXAMPLES
To destroy two tables, films and distributors: DROP TABLE films, distributors; COMPATIBILITY
This command conforms to the SQL standard, except that the standard only allows one table to be dropped per command, and apart from the IF EXISTS option, which is a PostgreSQL extension. SEE ALSO
ALTER TABLE [alter_table(7)], CREATE TABLE [create_table(7)] SQL - Language Statements 2010-05-14 DROP TABLE(7)
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