How do I insert a row of values to a table with a composite foreign key that includes the primary key?

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I keep on getting errors when trying to insert values into my table that has a composite foreign key that consists of the primary key as well as another attribute. Here is my Query:

SQL

CREATE TABLE `User` (
  `IC` varchar(50),
  `Name` varchar(50),
  `PhNo` int(12),
  `Email` varchar(50),
  `UserType` varchar(50),
  CONSTRAINT UNIQUE (IC,UserType),
  PRIMARY KEY (`IC`)
);

CREATE TABLE `Patient` (
  `IC` varchar(50),
  `Case` varchar(50),
  `UserType` varchar(50),
  FOREIGN KEY (IC,UserType) REFERENCES USER (IC,UserType),
  PRIMARY KEY (`IC`)
);

When I tried to manually insert using a query, an syntax error pops up.

What I have tried:

This is the insert query that I had tried

SQL

INSERT INTO PATIENT(IC,Case,UserType) VALUES ("123456789101","Non-Urgent","Patient");

Posted 10-Jan-23 10:25am

Allysha April

Updated 10-Jan-23 22:02pm

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Richard Deeming · Accepted Answer · 2023-01-10T22:02:00

You haven't told us what the error is, so all we can do is guess.

At a guess, you have the ANSI_QUOTES[^] SQL mode enabled, which means:

MySQL :: MySQL 8.0 Reference Manual :: 9.1.1 String Literals[^]:
If the ANSI_QUOTES SQL mode is enabled, string literals can be quoted only within single quotation marks because a string quoted within double quotation marks is interpreted as an identifier.

Therefore, you would need to fix your string literals:

SQL

INSERT INTO PATIENT (IC, Case, UserType) VALUES ('123456789101', 'Non-Urgent', 'Patient');

OriginalGriff · Accepted Answer · 2023-01-10T20:11:00

Solution 1

USER is a MySql Keyword and shouldn't be used as a table name - if it is, it probably needs to be enclosed in backticks:

FOREIGN KEY (IC,UserType) REFERENCES `USER` (IC,UserType),

Fix that, and your problem may go away.

Posted 10-Jan-23 20:11pm

OriginalGriff