ChatGPT解决这个技术问题 Extra ChatGPT

How to get primary key column in Oracle?

I need to get the name of the primary key column.

In the input, I only have the table name.


R
Richie
SELECT cols.table_name, cols.column_name, cols.position, cons.status, cons.owner
FROM all_constraints cons, all_cons_columns cols
WHERE cols.table_name = 'TABLE_NAME'
AND cons.constraint_type = 'P'
AND cons.constraint_name = cols.constraint_name
AND cons.owner = cols.owner
ORDER BY cols.table_name, cols.position;

Make sure that 'TABLE_NAME' is in upper case since Oracle stores table names in upper case.


Thanks, Richie. One more question: how to encode 'P' ? I need to execute this with "EXECUTE IMMEDIATE". thnx again.
I think you would just put two single quotes round it like this ''P''
Alternatively, you could quote it using q.
and constraint_type = 'R' for foreign key
Worked for me when not having the schema prefix before the table! Thanks!
M
Mat

Same as the answer from 'Richie' but a bit more concise.

Query for user constraints only SELECT column_name FROM all_cons_columns WHERE constraint_name = ( SELECT constraint_name FROM user_constraints WHERE UPPER(table_name) = UPPER('tableName') AND CONSTRAINT_TYPE = 'P' ); Query for all constraints SELECT column_name FROM all_cons_columns WHERE constraint_name = ( SELECT constraint_name FROM all_constraints WHERE UPPER(table_name) = UPPER('tableName') AND CONSTRAINT_TYPE = 'P' );


@FearlessFuture For me it worked well. Can you describe your problem a bit more expressive?
I don't get any results from this query, but I do get results from the query for the accepted answer.
@FearlessFuture I assume that the constraint you are searching for isn't a user constraint. Replace user_constraints by all_constraints.
This causes trouble if you have a table with the same name in two or more schemas - need to also include owner in the join: SELECT owner, column_name, position FROM all_cons_columns WHERE (owner, constraint_name) in (SELECT owner, constraint_name FROM all_constraints WHERE UPPER(table_name) = UPPER('&tableName') AND CONSTRAINT_TYPE = 'P') order by owner, position;
@MarkStewart I aggree the second Query will not work. But your solution is inefficient. Try: "SELECT cols.column_name AS KEY_STREAM, '=' AS KEY_CONDITION, cols.column_name as KEY_LOOKUP, '' AS KEY_STREAM2 FROM user_constraints cons, user_cons_columns cols WHERE cons.constraint_name = cols.constraint_name and CONSTRAINT_TYPE = 'P' and cons.table_name = '' and cons.table_name = cols.table_name;"
A
Alexander Hartmaier
Select constraint_name,constraint_type from user_constraints where table_name** **= ‘TABLE_NAME’ ;

(This will list the primary key and then)

Select column_name,position from user_cons_columns where constraint_name=’PK_XYZ’; 

(This will give you the column, here PK_XYZ is the primay key name)


s
sainu

Try This Code Here I created a table for get primary key column in oracle which is called test and then query

create table test
(
id int,
name varchar2(20),
city varchar2(20),
phone int,
constraint pk_id_name_city primary key (id,name,city)
);

SELECT cols.table_name, cols.column_name, cols.position, cons.status, cons.owner FROM all_constraints cons, all_cons_columns cols WHERE cols.table_name = 'TEST' AND cons.constraint_type = 'P' AND cons.constraint_name = cols.constraint_name AND cons.owner = cols.owner  ORDER BY cols.table_name, cols.position;

B
Bugalugs Nash

Save the following script as something like findPK.sql.

set verify off
accept TABLE_NAME char prompt 'Table name>'

SELECT cols.column_name
FROM all_constraints cons NATURAL JOIN all_cons_columns cols
WHERE cons.constraint_type = 'P' AND table_name = UPPER('&TABLE_NAME');

It can then be called using

@findPK