Table: destroyer_1943
Columns: name
pennant
builder
laid_down
launched
commissioned

Question: when was the destroyer launched when it was laid down on 14 august 1942?
SQL: SELECT "launched" FROM destroyer_1943 WHERE "laid_down" = '14 august 1942'

Question: what is the launched date when the builder is john brown, clydebank?
SQL: SELECT "launched" FROM destroyer_1943 WHERE "builder" = 'john brown, clydebank'

Question: what is the pennant when the builder is yarrow, scotstoun?
SQL: SELECT "pennant" FROM destroyer_1943 WHERE "builder" = 'yarrow, scotstoun'

Question: what is the name when the laid down is 28 february 1943?
SQL: SELECT "name" FROM destroyer_1943 WHERE "laid_down" = '28 february 1943'

Question: when was it commissioned when the destroyer was built by scotts, greenock?
SQL: SELECT "commissioned" FROM destroyer_1943 WHERE "builder" = 'scotts, greenock'

Question: when was the launched date when the laid down date is 14 august 1942?
SQL: SELECT "launched" FROM destroyer_1943 WHERE "laid_down" = '14 august 1942'