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mysql query in shellscript

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# 1  
Old 12-20-2011
mysql query in shellscript
Hi,

I want to run below query on shellscript but having one problm.

Code:
ADV=$( mysql -h "$IP_ADDR" -u "$USER_NAME"  "$TABLE_NAME" -BNe" SELECT ADV FROM indata where inid='$INSTRUID' and  Date='$latest Date';" )


here Date column contans different below dates

Code:
2011-12-01
2011-12-05
2011-12-07
2011-12-08
.
.
2011-12-13

and i want to catch date as latest date i.e 2011-12-13

finally the query looks like

Code:
ADV=$( mysql -h "$IP_ADDR" -u "$USER_NAME"  "$TABLE_NAME" -BNe" SELECT ADV FROM indata where inid='$INSTRUID' and  Date='2011-12-13';" )



Also i want to make this script in minimum size code.

please help me to catch latest date.


Thanks
Last edited by aish11; 12-20-2011 at 09:16 AM..
# 2  
Old 12-20-2011
Tune your sql statement to get the max date
# 3  
Old 12-20-2011
Code:
ADV=$( mysql -h "$IP_ADDR" -u "$USER_NAME"  "$TABLE_NAME" -BNe" SELECT ADV FROM indata where inid='$INSTRUID' and  max(Date);" )

I think this is the minimalist fragment of code you can write to get what you want.
# 4  
Old 12-20-2011
Tried both the code..

Code:
ADV=$( mysql -h "$IP_ADDR" -u "$USER_NAME"  "$TABLE_NAME" -BNe" SELECT ADV FROM indata where inid='$INSTRUID' and  max(Date);" 
 
and
 
 
ADV=$( mysql -h "$IP_ADDR" -u "$USER_NAME"  "$TABLE_NAME" -BNe" SELECT ADV FROM indata where inid='$INSTRUID' and  Date=max(Date);"


getting error -invalid use of group function


can u plz tell me the right command , i ma fresher new to mysql command also
# 5  
Old 12-20-2011
You could use either:

Code:
select adv 
from indata
where inid = '$INSTRUID'
and Date = ( 
    select max(Date) 
    from indata
    where inidi = '$INSTRUID'
    limit 1
    )
limit 1;

Or:

Code:
select a.adv
from indata a
join (
  select inid, max(Date) Date    
  from indata 
  where inid = '$INSTRUID' 
  group by inid
   ) b
  on a.inid =  b.inid
  and a.Date = b.Date
  where a.inid = '$INSTRUID'
  limit 1
  ;

I've added the limit clause for safety (not knowing your table structure and data, it's impossible to know if duplicates are possible).
# 6  
Old 12-20-2011
issue the following command in MySQL prompt
and post here again
Code:
mysql> use your_databse_name;
mysql>desc  indata ;

# 7  
Old 12-20-2011
Code:
mysql> desc indata;
+--------------+---------------------+------+-----+---------+-------+
| Field        | Type                | Null | Key | Default | Extra |
+--------------+---------------------+------+-----+---------+-------+
| MDate   | date                | NO   | PRI | NULL    |       |
| OPrice | double              | NO   |     | 0       |       |
| CPrice | double              | NO   |     | 0       |       |
| Volume | double              | NO   |     | 0       |       |
| ADV          | bigint(20) unsigned | NO   |     | 0       |       |
| InID | int(20) unsigned    | NO   | PRI | NULL    |       |
+--------------+---------------------+------+-----+---------+-------+



sorry its MDate

---------- Post updated at 06:25 AM ---------- Previous update was at 06:23 AM ----------

Quote:
Originally Posted by radoulov
You could use either:

Code:
select adv 
from indata
where inid = '$INSTRUID'
and Date = ( 
    select max(Date) 
    from indata
    where inidi = '$INSTRUID'
    limit 1
    )
limit 1;

Or:

Code:
select a.adv
from indata a
join (
  select inid, max(Date) Date    
  from indata 
  where inid = '$INSTRUID' 
  group by inid
   ) b
  on a.inid =  b.inid
  and a.Date = b.Date
  where a.inid = '$INSTRUID'
  limit 1
  ;

I've added the limit clause for safety (not knowing your table structure and data, it's impossible to know if duplicates are possible).

thanks radoulov but can i get any shorcut code??
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