板球管理器的SQL查询

Question

I have an 2 Table

TEAMS -TeamId,TeamName,Country
Players-PlayerID,PlayerName,TotalScore,ToTalMatch,TotalRuns,AvgRunRate.

Now I want to create a table TEAMPLAYERS..which has to contain TEAMID,PlayerId...and if details is deleted in TEAMS,PLAYERS table..the data must be delete in THIRD TABLE..PLS HELP ME

Answer 1

Here is how you create a table with foreign key constraint with cascade delete.

CREATE TABLE TEAMPLAYERS (
.....
teamId int(11) NOT NULL,
playerId int(11) NOT NULL,
FOREIGN KEY(teamId)
REFERENCES TEAMS(teamId)
ON DELETE CASCADE,
FOREIGN KEY(playerId)
REFERENCES PLAYERS(playerId)
ON DELETE CASCADE
.....
);

Note: ... are to be filled with other desired columns/constraints on TEAMPLAYERS table. Additionally, refer to this other post which asks a similar question MySQL foreign key constraints, cascade delete

Hope this helps!