Re: Query ID Values

[tango ward <tangoward15@xxxxxxxxx>]

Hi,

Yes sorry, here's the tables:

[cur_t DB] [student_profile table]


        Column        |          Type          | Collation | Nullable |        Default        |
----------------------+------------------------+-----------+----------+-----------------------+
 studentnumber        | character varying(45)  |           | not null | ''::character varying |
 firstname            | character varying(60)  |           |          |                       |
 middlename           | character varying(60)  |           |          |                       |
 lastname             | character varying(60)  |           |          |                       |
 course               | character varying(150) |           | not null | ''::character varying |

[cur_p DB] [profile table]

        Column        |          Type          | Collation | Nullable |        Default        |
----------------------+------------------------+-----------+----------+-----------------------+
 studentnumber        | character varying(45)  |           | not null | ''::character varying |
 firstname            | character varying(60)  |           |          |                       |
 middlename           | character varying(60)  |           |          |                       |
 lastname             | character varying(60)  |           |          |                       |
 program_id           | integer                |           | not null |                       |
 department_id        | integer                |           | not null |                       |
 campus_id            | integer                |           | not null |                       |

So I am migrating the data from one database to another. Here, I am moving data of student from student_profile table to profile table.

I have already migrated the course data to another table. What I would like to do is get the value of program_id and department_id for the profile table. I want to check if the course exist in profile_program table, then get it's ID. I think I can use the same logic for getting and setting value for the department_id column of profile table. I am using psycopg2 to access and move the data.

for row in cur_t:

          course = row['course']

          # Here I would like to get the value of program_id and department_id and insert it to the said columns but I don't know how to do it yet

          # I put ?? in department_id coz I don't know how to access the 3 department IDs in this query.

          cur_p.execute(""" SELECT id from st_profile where name='$[course]' and department_id=?? """)

          x = cur_p.fetchall()

          # This will print an error since I added department_id without value yet but if I remove it, I will get "None"

          print x

         

Sorry for asking questions a lot, we don't have DBA at the moment.

Thanks,

J

On Tue, May 15, 2018 at 9:57 AM, melvin6925 <melvin6925@xxxxxxxxx> wrote:

Perhaps if you care to provide us with the structure of all tables involved, we could suggest a reasonable query.

Sent via the Samsung Galaxy S® 6, an AT&T 4G LTE smartphone

-------- Original message --------

From: tango ward <tangoward15@xxxxxxxxx>

Date: 5/14/18 21:08 (GMT-05:00)

To: "pgsql-generallists.postgresql.org" <pgsql-general@lists.postgresql.org>

Subject: Query ID Values

Good Day,

I need to run an SQL query and get a program_id and department_id of a specific course for each student. I am thinking of running an IF condition to check if the course name is in program and get it's ID but I don't know yet where to use the IF condition in the query.

sample code:

for row in cur_t:

     course = row['course']

     cur_p.execute("""SELECT id from program where name='$[course]']

                               WHERE department_id=?? """)

Problem is I have 3 department IDs ( Senior High, Vocational, Undergraduate ) and each ID have multiple programs/courses. Each program/course is connected to the deparment table via department_id.

May I ask an advice on how to approach this?

Thanks,

J