SQL Srver foreign key error - sql

Question

I have this assignment for beginning sql server to add foreign keys to these tables. The last ALTER TABLE command always throws an error
There are no primary or candidate keys in the referenced table 'TCases' that match the referencing column list...
and I really can't figure out why it's giving this error. Any insight is appreciated.
CREATE TABLE TCourtRooms
( intCourtRoomID INTEGER NOT NULL
,strCourtRoomNumber VARCHAR(50) NOT NULL
,strJudgeLastName VARCHAR(50) NOT NULL
,strJudgeFirstName VARCHAR(50) NOT NULL
,CONSTRAINT TCourtDockets_PK PRIMARY KEY (intCourtRoomID)
)
CREATE TABLE TCases
( intCourtRoomID INTEGER NOT NULL
,intCaseIndex INTEGER NOT NULL
,strCaseNumber VARCHAR(50) NOT NULL
,strDescription VARCHAR(50) NOT NULL
,CONSTRAINT TCases_PK PRIMARY KEY (intCourtRoomID, intCaseIndex)
)
CREATE TABLE TPersons
( intCourtRoomID INTEGER NOT NULL
,intCaseIndex INTEGER NOT NULL
,intPersonIndex INTEGER NOT NULL
,strLastName VARCHAR(50) NOT NULL
,strFirstName VARCHAR(50) NOT NULL
,strPersonRole VARCHAR(50) NOT NULL --Options are plaintiff or defendant
,CONSTRAINT TPlaintiffs_PK PRIMARY KEY (intCourtRoomID, intCaseIndex, intPersonIndex)
)
CREATE TABLE TLawyers
( intLawyerID INTEGER NOT NULL
,intCaseIndex INTEGER NOT NULL
,intPersonIndex INTEGER NOT NULL
,strLastName VARCHAR(50) NOT NULL
,strFirstName VARCHAR(50) NOT NULL
,strLawyerRole VARCHAR(50) NOT NULL --plaintiff or defendant
,CONSTRAINT TLawyers_PK PRIMARY KEY (intLawyerID, intCaseIndex, intPersonIndex)
,CONSTRAINT TLawyers_intLawyerID_strLawyerRole_UN UNIQUE (intLawyerID, strLawyerRole)
)
Problem 3.2 Identify and create foreign keys
-- Child Parent Column(s)
-- ----- ------ ---------
-- TCases TCourtRooms intCourtRoomID
-- TPersons TCases intCourtRoomID, intCaseIndex
-- TLawyers TCourtRooms
ALTER TABLE TCases
ADD CONSTRAINT TCases_TCourtRooms_FK
FOREIGN KEY (intCourtRoomID) REFERENCES TCourtRooms (intCourtRoomID)
ALTER TABLE TPersons
ADD CONSTRAINT TPersons_TCases_FK
FOREIGN KEY (intCourtRoomID, intCaseIndex) REFERENCES TCases (intCourtRoomID, intCaseIndex)
ALTER TABLE TLawyers
ADD CONSTRAINT TLawyers_TCases_FK
FOREIGN KEY (intCaseIndex) REFERENCES TCases (intCaseIndex)</code>

Answer 1

This is the primary key for TCases:
CONSTRAINT TCases_PK PRIMARY KEY (intCourtRoomID, intCaseIndex)
It is a composite primary key, with two parts. You need to include both keys in the declaration:
ALTER TABLE TLawyers
ADD CONSTRAINT TLawyers_TCases_FK
FOREIGN KEY (intCaseIndex) REFERENCES TCases (intCourtRoomId, intCaseIndex)
But, alas, you cannot because the field TLawyers.intCourtRoomId does not exist. I'm not sure what you should do:
Add the field to TLawyers.
Fix the primary key definition to reference only one column.
Do something else.
But that is your problem.