Thursday, 16 January 2014

If Table1.ColumnA is indexed, will a foreign key Table2.ColumnA_FK be indexed as well?

If Table1.ColumnA is indexed, will a foreign key Table2.ColumnA_FK be
indexed as well?



1.Source Qualifier Transformation

Description:... you can enable constraint-based loading in a session to
have informatica load data based on target table primary and foreign key
... indexed. Default Join . When ...



2.Ask Tom "Indexes on foreign keys"

Description:... , max(decode( position, 1, column_name, null )) cname1 ...
and if child foreign key is not indexed, ... alter table c add foreign key
...



3.HOWTO: Compare two tables | Oracle Forums

Description:SELECT table1.column_list ... e.g. state_code table with 50
records) then this may well be the fastest approach since ... t1_t2_fk
FOREIGN KEY ...



4.MySQL :: MySQL 5.0 Reference Manual :: 14.2.3.4 InnoDB and ...

Description:InnoDB permits a foreign key to reference any index column or
group of columns. However, in the referenced table, there must be an index
where the ...



5.Oracle/PLSQL: Foreign Keys - techonthenet.com

Description:A foreign key means that values in one table must also appear
in another table.



6.13.1.10 CREATE TABLE Syntax - Oracle Documentation

Description:... or 0 into an indexed ... See Section 8.5.1, "Column ...
(child table) row containing such a foreign key is permitted to be ...



7.Source Qualifier Transformation - Docstoc.com

Description:... data based on target table primary and foreign key ...
tables are indexed. ... TABLE2 ON TABLE1.COLUMNA = TABLE2.COLUMNA TABLE3
...



8.MySQL :: MySQL 5.6 Reference Manual :: 13.1.7 ALTER TABLE Syntax

Description:... MySQL tries to convert existing column values to the new
type as well as ... table users add foreign key ... ref' column to become
uniquely indexed.



9.Table Design

Description:... (Primary Key) MatchName. Team1ID (Foreign to "TeamID" in
... large varchar's can be indexed. ... increase if I can index the
"MatchPlayer1" table as well ...



10.13.1.17 CREATE TABLE Syntax - Oracle Documentation

Description:See Section 8.5.1, "Column ... (child table) row containing
such a foreign key is ... as well as additional examples of table creation
and ...

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