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Assigning an index to a constraint


Assigning an index to a constraint

By : phongchoi
Date : November 22 2020, 10:31 AM
I hope this helps you . I have a script written for Oracle databases that I'm converting to work in SQL Server and I have two questions about a specific section of code. , In Oracle, you can do
code :
alter table PORTAL_ROLE add constraint pk_portalroles primary key('ROLE_NAME');


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What is the difference between assigning a value to an index of an array and assigning a value to the alias of the index

What is the difference between assigning a value to an index of an array and assigning a value to the alias of the index


By : user3181381
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , TestName is NOT an alias to arrTestResults[0].
I'm assuming that arrTestResults is string[] and that TestName is too.
code :
TestName = arrTestResults[0] = "";
int y = 0;
int x = y = 17;
arrTestResults[0] = "Test 1: General";
y = 42;
 TestName = "Test 1: General"; 
x = 69;
Failed to add the foreign key constraint. Missing index for constraint Error Code: 1822

Failed to add the foreign key constraint. Missing index for constraint Error Code: 1822


By : Jason
Date : March 29 2020, 07:55 AM
this one helps. You have a composite primary key, so you need a composite foreign key:
code :
CREATE TABLE Prerequisite_to(
    infs CHAR(4),
    course_number CHAR(3),
    PRIMARY KEY (infs,course_number),
    FOREIGN KEY (infs, course_number) REFERENCES Class(infs, course_number)
);
CREATE TABLE Classes (
    class_id int auto_increment primary key,
    infs CHAR(4) NOT NULL,
    course_number CHAR(3) NOT NULL,
    unique (infs, course_number)
);

CREATE TABLE Prerequisites (
    preresequisite_id int auto_increment primary key,
    class_id int,
    prerequisite_class_id int,
    FOREIGN KEY (class_id) REFERENCES Classes(class_id),
    FOREIGN KEY (prerequisite_class_id) REFERENCES Classes(class_id)
);
Error Code: 1822. Failed to add the foreign key constraint. Missing index for constraint 'employee_ibfk_1' in the refere

Error Code: 1822. Failed to add the foreign key constraint. Missing index for constraint 'employee_ibfk_1' in the refere


By : user2676479
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , You should probably add a primary key on addressid in the Address table, this will create the index needed. In your current script there is no guarantee that addressid will be unique, hence if there would be duplicates a foreign key could never determine which row to refer to.
code :
create table address(addressId int primary key not null, city varchar(10), pincode varchar(10));
MySQL error: Failed to add the foreign key constraint. Missing index for constraint

MySQL error: Failed to add the foreign key constraint. Missing index for constraint


By : user3553140
Date : March 29 2020, 07:55 AM
it helps some times I have searched questions about this problem: , You have to read the documentation carefully:
Error Code: 1822. Failed to add the foreign key constraint. Missing index for constraint 'ekdromes_ibfk_1' in the refere

Error Code: 1822. Failed to add the foreign key constraint. Missing index for constraint 'ekdromes_ibfk_1' in the refere


By : Delator Tinch
Date : March 29 2020, 07:55 AM
wish helps you You have defined the primary key to be pwlhseis(ma). That is what you should be using for foreign key references.
Personally, I name primary keys and foreign keys to match, So, this would look like:
code :
create table pwlhseis (
    pwlhseis_id int primary key,
    . . .
);

create table ekdromes (
    ekdromes_id int primary key,
    . . .
    pwlhseis_id int,
);

alter table ekdromes 
  add constraint fk_ekdromes_pwlhseis foreign key (pwlhseis_id) references pwlhseis(pwlhseis_id);
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