Assim:
SELECT t.table_name,
CASE
WHEN c.constraint_type IS NULL
THEN 'NO'
ELSE 'YES'
END AS tem_pk
FROM information_schema.tables t
LEFT OUTER JOIN (SELECT *
FROM information_schema.table_constraints
WHERE constraint_type = 'PRIMARY KEY'
AND table_schema = 'SEU_SCHEMA'
AND table_catalog = 'SUA_BASE') c
ON c.table_name = t.table_name
WHERE t.table_name NOT LIKE '%sy%'
AND t.table_name NOT LIKE '%MS%'
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