Table: destroyer_1943_2
Columns: name
pennant
builder
laid_down
launched
commissioned

Question: What is the building for the r90 pennant?
SQL: SELECT "builder" FROM destroyer_1943_2 WHERE "pennant" = 'r90'

Question: What is the pennant with Denny, Dumbarton as the builder?
SQL: SELECT "pennant" FROM destroyer_1943_2 WHERE "builder" = 'denny, dumbarton'

Question: What is the laid down date of the destroyer with a r29 pennant?
SQL: SELECT "laid_down" FROM destroyer_1943_2 WHERE "pennant" = 'r29'