Constant GET_PARENT_BLOCK_ADDRESS

pub const GET_PARENT_BLOCK_ADDRESS: &str = "SELECT\n    block_address\nFROM\n    block\nWHERE\n    id = (\n        SELECT\n            parent_block_id\n        FROM\n            block\n        WHERE\n            block_address = :block_address\n        LIMIT\n            1\n    )\nLIMIT\n    1";

SELECT
    block_address
FROM
    block
WHERE
    id = (
        SELECT
            parent_block_id
        FROM
            block
        WHERE
            block_address = :block_address
        LIMIT
            1
    )
LIMIT
    1