sql concatenation

Question

我可以連接如下的查詢嗎？如果不是，我應該如何繼續？我不想從$retrieveUnitExist讀取行，因爲它浪費了另一個步驟。

$retrieveUnitExist = "SELECT unitid FROM ESTATEUNIT WHERE BLOCK = 1"; 
$insertAddress = "INSERT INTO ADDRESS (value1, value2) VALUES ('1','".$retrieveUnitExist."')"; 

mysqli_query($conn, $insertAddress); 

Answer 1

這樣的事情？

$insertAddress = "INSERT INTO ADDRESS (value1, value2) 
        SELECT '1', unitid FROM ESTATEUNIT WHERE BLOCK = 1";