在临时表创建中定义键

Question

如何为从SELECT语句创建的临时表定义键？

我有:

CREATE temporary TABLE _temp_unique_parts_trading 
engine=memory AS 
  (SELECT parts_trading.enquiryref, 
          sellingcurrency, 
          jobs.id AS jobID 
   FROM   parts_trading, 
          jobs 
   WHERE  jobs.enquiryref = parts_trading.enquiryref 
   GROUP  BY parts_trading.enquiryref) 

但是我在哪里定义键？

Answer 1

你可以这样做

CREATE temporary TABLE _temp_unique_parts_trading 
(
  enquiryref varchar(255),
  sellingcurrency varchar(255),
  jobID int(10),
  key(jobId)
)
engine=memory AS 
  (SELECT parts_trading.enquiryref, 
          sellingcurrency, 
          jobs.id AS jobID 
   FROM   parts_trading, 
          jobs 
   WHERE  jobs.enquiryref = parts_trading.enquiryref 
   GROUP  BY parts_trading.enquiryref) 

基本上在TABLE_NAME之后附加表模式(索引,列数据类型)