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(1) Get Customer_ID from Customer table, where name is "John" (2) If there are no Customer_ID returned (There is no John), insert "John" (3) Get Customer_ID from Customer table, where name is "John" (4) Insert "Customer_ID" and "1.34" into Order table.
Case 1: Insert Row and Query Foreign Key. Here is an alternate syntax I use: INSERT INTO tab_student SET name_student = 'Bobby Tables', id_teacher_fk = ( SELECT id_teacher FROM tab_teacher WHERE name_teacher = 'Dr. Smith')
16 lip 2013 · Your syntax is almost good, needs some parenthesis around the subqueries and it will work: INSERT INTO bar (description, foo_id) VALUES. ( 'testing', (SELECT id from foo WHERE type='blue') ), ( 'another row', (SELECT id from foo WHERE type='red' ) ); Tested at DB-Fiddle.
The FOREIGN KEY constraint is a key used to link two tables together. A FOREIGN KEY is a field (or collection of fields) in one table that refers to the PRIMARY KEY in another table. The following SQL creates a FOREIGN KEY on the "PersonID" column when the "Orders" table is created:
The FOREIGN KEY constraint is used to prevent actions that would destroy links between tables. A FOREIGN KEY is a field (or collection of fields) in one table, that refers to the PRIMARY KEY in another table.
1 lut 2016 · I am creating a database where I have a table with a foreign key. I am using the following command: insert into ques_bank (q_no, uid, question) values (NULL, select uid from user_info where username ='more','jdkjfsd dkskdsn skdjsd');
A foreign key is a column or a group of columns in one table that uniquely identifies a row of another table (or the same table in case of self-reference). To create a foreign key, you use the FOREIGN KEY constraint.
