A script to test existence of primary keys

问题

Trying to figure out a SQL script to test the existence of primary keys in cerain tables. If the table has no primary key, then the script should output the table name.

Tables to test:
TableA
TableB
TableC

After running the script (and lets say TableA and TableC have PKs, but not TableB), then the output would be below:

NoKeys
TableB

回答1:

;WITH tables_with_pk AS (
  SELECT t.table_schema, t.table_name  
  FROM INFORMATION_SCHEMA.TABLES t 
    INNER JOIN INFORMATION_SCHEMA.TABLE_CONSTRAINTS tc 
      ON t.TABLE_NAME = tc.TABLE_NAME AND t.table_schema = tc.table_schema
  WHERE tc.constraint_type = 'PRIMARY KEY'
)
SELECT t.table_schema, t.table_name 
FROM INFORMATION_SCHEMA.TABLES t 
EXCEPT
SELECT table_schema, table_name
FROM tables_with_pk

回答2:

I don't have the exact/complete code for you, but here's the idea:

You'll need to loop through your list of tables in the database:

SELECT *  
FROM information_schema.tables`

The code to check if a Primary Key exists for your table would be something like:

SELECT *  
FROM information_schema.table_constraints  
WHERE constraint_type = 'PRIMARY KEY'   
AND table_name = @Your_Table_Name`

回答3:

Returns 0 if no primary key, Returns 1 if there is a primary key

SELECT OBJECTPROPERTY(OBJECT_ID(N'MyTable'),'TableHasPrimaryKey')

回答4:

How about

USE information_schema;
SELECT `TABLE_NAME` FROM `TABLES` LEFT JOIN `TABLE_CONSTRAINTS` USING(`TABLE_SCHEMA`, `TABLE_NAME`) WHERE `TABLE_SCHEMA` = '__PUT_YOUR_DB_NAME_HERE__' AND `CONSTRAINT_NAME` LIKE '%PRIMARY%' AND ISNULL(`CONSTRAINT_CATALOG`)

回答5:

I liked Sean's answer and it worked for me. You can add the clause

WHERE t.TABLE_TYPE = 'BASE TABLE'

just before the EXCEPT statement if you don't want to also get views back.

;WITH tables_with_pk AS (
  SELECT t.table_schema, t.table_name
  FROM INFORMATION_SCHEMA.TABLES t 
    INNER JOIN INFORMATION_SCHEMA.TABLE_CONSTRAINTS tc 
      ON t.TABLE_NAME = tc.TABLE_NAME AND t.table_schema = tc.table_schema
  WHERE tc.constraint_type = 'PRIMARY KEY' 
)
SELECT t.table_schema, t.table_name
FROM INFORMATION_SCHEMA.TABLES t 
WHERE t.TABLE_TYPE = 'BASE TABLE'
EXCEPT
SELECT table_schema, table_name
FROM tables_with_pk

来源：https://stackoverflow.com/questions/13258297/a-script-to-test-existence-of-primary-keys

标签

sql

sql-server

sql-server-2005