String ag ="ALTER TABLE QUESTION"+
"(ADD FOREIGN KEY (a_status) REFERENCES ANSWER(a_status))";
stmt.executeUpdate(ag);
Error message:
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an
error in your SQL syntax; check the manual that corresponds to your
MySQL server version for the right syntax to use near 'FOREIGN KEY
(a_status) REFERENCES ANSWER(a_status))' at line 1
This should be correct. See the offical documentation:
String ag ="ALTER TABLE QUESTION ADD FOREIGN KEY (a_status) REFERENCES ANSWER(a_status)";
String ag ="ALTER TABLE QUESTION ADD CONSTRAINT (question_answer_fk1) FOREIGN KEY (a_status) REFERENCES ANSWER(a_status)";
Also you can have more condition specific to add:
ON DELETE SET NULL/CASCADE
ON UPDATE SET NULL
String ag ="ALTER TABLE QUESTION ADD CONSTRAINT (question_answer_ibfk1) FOREIGN KEY (a_status) REFERENCES ANSWER(a_status)";
In general
ALTER TABLE Child_tblName
ADD CONSTRAINT 'give any name to the foreign key generally I do Child_tblName_Parent_tblName_ibfk_number' FOREIGN KEY ('Child_tblName's Column') REFERENCES Parent_tblName('Parent_tblName's Column')
Related
Apply changes to exams Error 1064: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '
CONSTRAINT `reg`
FOREIGN KEY (`reg`)
REFERENCES `students`.`stdinf...
at line 6 SQL Statement:
CREATE TABLE `students`.`exams`
(
`reg`VARCHAR(25) NOT NULL,
`code`VARCHAR(10) NOT NULL,
`marks` INT NULL,
PRIMARY KEY (`reg`, `code`),
INDEX `code_idx` (`code`ASC) VISIBLE,
CONSTRAINT`reg`
FOREIGN KEY (`reg`)
REFERENCES `students`.`stdinfo` (`reg`)
ON DELETE NO ACTION
ON UPDATE NO ACTION,
CONSTRAINT `code`
FOREIGN KEY (`code`)
REFERENCES `students`.`courses` (`code\`)
ON DELETE NO ACTION
ON UPDATE NO ACTION
)
I wanted to make foreign key in third table for connecting my other two tables but it showing this error.
ALTER TABLE cart
ADD COLUMN name varchar NOT NULL AFTER cartID
FOREIGN KEY (name) REFERENCES products(p_name);
error - #1064 - You have an error in your SQL syntax; check the manual
that corresponds to your MariaDB server version for the right syntax
to use near 'AFTER cartID
FOREIGN KEY (name) REFERENCES products(p_name)' at line 2
Try this
ALTER TABLE cart
ADD COLUMN name varchar(10) NOT NULL;
ALTER TABLE cart
ADD FOREIGN KEY (name) REFERENCES products1(p_name);
Check this http://rextester.com/IJFDC23276
Try this
ALTER TABLE cart
ADD name VARCHAR NOT NULL,
ADD CONSTRAINT FOREIGN KEY(name) REFERENCES products(p_name);
I'm trying to understand why a parsing error occurred (1064) with the following code.
<#1064 - You have an error in your SQL syntax; check the manual that
corresponds to your MySQL server version for the right syntax to use
near '' at line 3>
CREATE TABLE Party_Library
(
Party INT(11)
Library varchar(40)
PRIMARY KEY (Library,Party)
FOREIGN KEY (Party) REFERENCES Party(PartyKey) ON DELETE CASCADE
FOREIGN KEY (Library) REFERENCES MusicLibraries(MusicSource) ON DELETE CASCADE
)
You are missing commas after each declaration:
CREATE TABLE Party_Library
(
Party INT(11),
Library varchar(40),
PRIMARY KEY (Library,Party),
FOREIGN KEY (Party) REFERENCES Party(PartyKey) ON DELETE CASCADE,
FOREIGN KEY (Library) REFERENCES MusicLibraries(MusicSource) ON DELETE CASCADE
);
I am a total beginner in MySQL
Whenever I try to add a foreign key to a field it produces this error:
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'ADD FOREIGN KEY ID
Here's the code to add foreign key:
ALTER TABLE 'table_name'
ADD CONSTRAINT 'FK_FKName'
ADD FOREIGN KEY table_name(column_name)
REFERENCES OtherTable_name(OtherTable_column_name);
Please try to help me
you can try without constraint name :
ALTER TABLE 'table_name'
ADD FOREIGN KEY table_name(column_name)
REFERENCES OtherTable_name(OtherTable_column_name);
I think your syntax is a little wrong.
Try this:
ALTER TABLE 'table_name'
ADD CONSTRAINT 'FK_Name' FOREIGN KEY ('coloumn_name')
REFERENCES 'table_name'('coloumn_name');
The syntax is like , please update as
ALTER TABLE employee
ADD CONSTRAINT fk_department
FOREIGN KEY (departmentID)
references department (departmentID);
If i do the first one i have no problem. When i do addition i get a syntax error. What is wrong with the syntax? The error says syntax error near [entire 2nd line]
alter table `ban_Status` add FOREIGN KEY (`banned_user`) REFERENCES `user_data`(`id`)
alter table `ban_Status` add FOREIGN KEY (`banned_user`) REFERENCES `user_data`(`id`),
FOREIGN KEY (`banning_user`) REFERENCES `user_data`(`id`),
FOREIGN KEY (`unban_user`) REFERENCES `user_data`(`id`)
I think you need "add" before lines 2 and 3. That or you need to name your constraints.