如何在sql中使用計數的返回值

Question

我正嘗試使用更新語句中由count重新調用的值。但得到語法錯誤。子查詢正在工作。但更新查詢不起作用。需要做出什麼改變才能獲得正確的結果？

update Items set numberOfBids = count (select * from Bids where id ='1673078805') where id='1673078805';  
Error: near "select": syntax error 


sqlite> select * from Bids where id ='1673078805'; 
1673078805|brettgodfrey|14.52|2001-12-05 10:40:41 
1673078805|gardnerstoys|15.04|2001-12-06 07:40:41 
1673078805|tallulahbankhead|14.01|2001-12-04 13:40:41 
1673078805|tgrhino@home.com|15.55|2001-12-07 04:40:41 
1673078805|yesterdaysgem|16.06|2001-12-08 01:40:41 


sqlite> update Items set numberOfBids = 5 where id='1673078805'; 

Answer 1

移動計數到子查詢：

update Items 
set numberOfBids = 
    (select count(*) 
     from Bids 
     where id ='1673078805') 
where id='1673078805'; 

Answer 2

試試這個SQL：

UPDATE Items 
SET numberOfBids = (SELECT count(*) 
        FROM Bids 
        WHERE id ='1673078805') 
WHERE id='1673078805';