a list of all the tables, columns and their consntraints in the database
Hello
I need to write sql code which considers a list of all tables in the database, their columns and the primary or foreign key for each column (if any) and the refrence for each foreign key column.
Any ideas how ro?
DROP TABLE table_b; DROP TABLE table_a; -- CREATE TABLE table_a ( CONSTRAINT pk_table_a PRIMARY KEY (column_b) ,column_a INTEGER ,column_b INTEGER ); -- CREATE TABLE table_b ( column_c INTEGER ,column_d INTEGER CONSTRAINT fk_table_a REFERENCES table_a(column_b) ); -- SELECT utc.table_name ,utc.column_name ,CASE WHEN uc.constraint_type = 'P' AND position IS NOT NULL THEN uc.constraint_name END primary_key ,CASE WHEN uc.constraint_type = 'R' AND position IS NOT NULL THEN uc.constraint_name END foreign_key ,CASE WHEN uc.constraint_type = 'R' AND position IS NOT NULL THEN uc.r_constraint_name END referenced_key FROM user_tab_cols utc LEFT JOIN user_constraints uc ON (utc.table_name = uc.table_name) LEFT JOIN user_cons_columns ucc ON(ucc.table_name = utc.table_name AND utc.column_name = ucc.column_name AND uc.constraint_name = ucc.constraint_name) WHERE utc.table_name IN ('TABLE_A','TABLE_B');
TABLE_NAME COLUMN_NAME PRIMARY_KEY FOREIGN_KEY REFERENCED_KEY
TABLE_A COLUMN_B PK_TABLE_A
TABLE_A COLUMN_A
TABLE_B COLUMN_D FK_TABLE_A PK_TABLE_A
TABLE_B COLUMN_C
If you want to 'improve' the referenced_key column for the column referenced actually, you need to join user_cons_colums once again and use the column position.
Concerning
Marcus
Tags: Database
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