sql-为表中的每个客户id插入新行

Question

I am using SQL server 2008. The following is my table:

Cust_id  Date           rate    type
3579    12/05/2014     0.01256   f
5200    13/05/2014     0.02365   f
1234    18/05/2014     0.05623   m
3456    23/05/2014     0.01254   m
7896    23/05/2014     0.01254   f
2589    21/05/2014     0.01254   m
3698    23/05/2014     0.01254   f

I would like to select all the customers that are type 'm' (that is easy enough) and I would like to insert a new row of Date,rate and type for each customer that is found. so the result would look something like this:

Cust_id  Date           rate     type
1234    18/05/2014      0.05623   m
1234    16/05/2014      0.02222   f
3456    23/05/2014      0.01254   m
3456    27/05/2014      0.03333   f
2589    21/05/2014      0.01254   m
2589    20/05/2014      0.01111   f

I will not be able to insert rows individually because I have over 5000 customers :-(. Could some experts assist me.

Thanks a ton in advance.

Answer 1

If you can compute required Date , Rate and Type from selected Date , Rate and Type you can use insert..select construction:

insert into Customers(
  Cust_id, 
  Date,
  Rate,
  Type)

  select Cust_id, 
         Date, -- TODO:Generate required Date from given one
         Rate, -- TODO:Generate required Rate from given one
         Type  -- TODO:Generate required Type from given one
    from Customers 
   where Type = 'm' 

Answer 2

看看INSERT ... SELECT语法