Avatar of geeta_m9
 asked on

Insert command generates error in MySQL

I was given the following code to create some tables in MySQL:

create table vt_staff (
    stf_id          decimal(6,0)   primary key
  , stf_name_last   varchar(25)    not null
  , stf_name_first  varchar(25)    not null
  , stf_job_title   varchar(25)    not null
  , constraint stf_id_range         check (stf_id > 0)
  , constraint job_title_values
         check ( stf_job_title in ('vet', 'vet assnt', 'clerical', 'kennel'))

create table vt_animals(
    an_id           decimal(6,0)  primary key
  , an_type         varchar(25)    not null  
  , an_name         varchar(25)    null
  , an_dob          date            not null
  , cl_id           decimal(6,0)     not null  
  ,  constraint an_id_range         check (an_id > 0)
  ,  constraint an_dob_ck           check (trunc(an_dob) = an_dob)

create table vt_exam_headers(
    ex_id           decimal(6,0)     primary key
  , an_id           decimal(6,0)     not null  
  , stf_id          decimal(6,0)     not null  
  , ex_date         date            not null
  , constraint vt_exam_headers_animal_fk  foreign key(an_id) references vt_animals
  , constraint vt_exam_headers_staff_fk   foreign key(stf_id) references vt_staff
  , constraint ex_id_range          check (ex_id > 0)
  , constraint exam_date_range      check (ex_date >= date '2010-01-01')

All the code executed fine. However when I tried running the following insert statements for the vt_exam_headers table, I keep obtaining an error, e.g..,

insert into vt_exam_headers(ex_id, an_id, stf_id, ex_date)
  values (2289, 21320, 38, TO_DATE('2015-04-11 13:00', 'YYYY-MM-DD HH24:MI') );

insert into vt_exam_headers(ex_id, an_id, stf_id, ex_date)
  values (2290, 21320, 38, TO_DATE('2015-04-11 17:00', 'YYYY-MM-DD HH24:MI') );
I believe the problem is related to the TO_DATE function, but am not sure of the correct syntax.

Would appreciate any help.
MySQL Server

Avatar of undefined
Last Comment
Olaf Doschke

8/22/2022 - Mon
Olaf Doschke

What is the error message saying?

If it tells something about TO_DATE or ex_date, your assumption might be right.

Why not test this isolated? echo TO_DATE('2015-04-11 13:00', 'YYYY-MM-DD HH24:MI');
It is not a native php function, so it must be defined, included or required somewhere, before you can execute it, otherwise you get the error "Call to undefined function TO_DATE()", which happens to me. So the function is not defined.

Since you just created tables, you also have to add animals and staff first, before the exams an_id and stf_id can be populated with existing IDs. You have a foreign key constraint, that means whatever value you put into vt_exam_headers.an_id and vt_exam_headers.stf_id have to exist in the animals and staff tables, this is what is promised with this constraint. It means exams point to a related staff member and animal, any ID not existing in those table is just that, a number, worthless, meaningless, so this is about the referential integrity of data and prevents you to store meaningless data.

Bye, Olaf.

I have already inserted the records into the other tables. The error I obtain is, "FUNCTION TO_DATE does not exist." When I enter, echo TO_DATE('2015-04-11 13:00', 'YYYY-MM-DD HH24:MI');",  like you suggested, I obtain the error: Error Code: 1064. You have an error in your SQL syntax; check the manual that corresponds to your server version for the right syntax..."
Olaf Doschke

Log in or sign up to see answer
Become an EE member today7-DAY FREE TRIAL
Members can start a 7-Day Free trial then enjoy unlimited access to the platform
Sign up - Free for 7 days
Learn why we charge membership fees
We get it - no one likes a content blocker. Take one extra minute and find out why we block content.
Not exactly the question you had in mind?
Sign up for an EE membership and get your own personalized solution. With an EE membership, you can ask unlimited troubleshooting, research, or opinion questions.
ask a question
I started with Experts Exchange in 2004 and it's been a mainstay of my professional computing life since. It helped me launch a career as a programmer / Oracle data analyst
William Peck