I am doing some MySQL coding but getting a few errors when entering data.
Can you have a look at my code and just see if I am missing something?
CREATE DATABASE test1
USE test1
CREATE TABLE subject1 (
s1_id INT NOT NULL AUTO_INCREMENT,
field1 VARCHAR(20),
field2 VARCHAR(30),
field3 CHAR(10),
field4 VARCHAR(30),
PRIMARY KEY (s1_id)
);
CREATE TABLE subject2 (
s2_id INT NOT NULL AUTO_INCREMENT,
s2_s1_id INT NOT NULL,
field5 VARCHAR(20),
field6 DATE,
field7 DATE,
Field8 INT,
PRIMARY KEY (s2_id),
FOREIGN KEY (s2_s1_id) REFERENCES subject1 (s1_id)
);
I keep getting a constraint error on the s2_s1_id field.
INPUT INTO subject2 (
`s2_s1_id`,
`field5`,
`field6`,
`field7`,
`field8`
)
VALUES (
'1',
' SOLOTION 2.5',
'2015-10-10 10:00:00',
'2015-10-11 10:30:00','25'
);
Mysql error 1452 - cannot add or update a child row: a foreign constraint fails.
Any thoughts? It's a DB for my own personal use to track my numbers for dialysis.
Related
So basically I want to create a trigger for mysql database that has same/similar function with the assertion code below (since mysql does not support assertion)
Here is the assertion code that I want to replicate using trigger
CREATE ASSERTION assert
CHECK NOT EXISTS(SELECT * FROM paper P WHERE 3 <>(SELECT COUNT(*)
FROM review R
WHERE R.paperid = P.paperid)
);
CREATE ASSERTION atmostfivepapers
CHECK NOT EXISTS(SELECT * FROM pcmember P WHERE 5 <
( SELECT *
FROM review R
WHERE R.email = P.email
)
);
And here is my table
CREATE TABLE paper(
paperid INT UNSIGNED NOT NULL AUTO_INCREMENT,
title VARCHAR(50) NOT NULL,
abstract VARCHAR(250),
pdf VARCHAR(100),
PRIMARY KEY(paperid)
);
CREATE TABLE author(
email VARCHAR(100) NOT NULL,
name VARCHAR(50),
affiliation VARCHAR(100),
PRIMARY KEY(email)
);
CREATE TABLE writePaper(
paperid INT UNSIGNED NOT NULL AUTO_INCREMENT,
email VARCHAR(100),
paper_order INT,
PRIMARY KEY(paperid, email),
FOREIGN KEY(paperid) REFERENCES paper(paperid),
FOREIGN KEY(email) REFERENCES author(email)
);
CREATE TABLE pcmember(
email VARCHAR(100) NOT NULL,
name VARCHAR(20),
PRIMARY KEY(email)
);
CREATE TABLE review(
reportid INT UNSIGNED,
sdate DATE,
comment VARCHAR(250),
recommendation CHAR(1),
paperid INT UNSIGNED,
email VARCHAR(100),
PRIMARY KEY(paperid, email),
FOREIGN KEY(paperid) REFERENCES paper(paperid),
FOREIGN KEY(email) REFERENCES pcmember(email)
);
Thanks in advance
First create another table replicating the columns and their features. Thereafter create a trigger.
CREATE TRIGGER afterInsert_trigger on yourMainTableName
FOR INSERT
AS
INSERT INTO yourTableCopy(column1ofYourReplicateTable, column2OFyourReplicateTable, ... etc)
SELECT column1ofYourMainTable, column2ofYourMainTable, ..., etc
FROM INSERTED
That's what I use in Microsoft SQL server
I recently bought this book called "SQL Queries for Mere Mortals (3rd Edition" to study SQL. It came with MySQL scripts that they said I could run and have example databases to work with and follow along with the book. However, some of the scripts are resulting in an error message. Here is one example script that will not work:
CREATE DATABASE EntertainmentAgencyModify;
USE EntertainmentAgencyModify;
CREATE TABLE Agents (
AgentID int NOT NULL AUTO_INCREMENT PRIMARY KEY,
AgtFirstName nvarchar (25) NULL ,
AgtLastName nvarchar (25) NULL ,
AgtStreetAddress nvarchar (50) NULL ,
AgtCity nvarchar (30) NULL ,
AgtState nvarchar (2) NULL ,
AgtZipCode nvarchar (10) NULL ,
AgtPhoneNumber nvarchar (15) NULL ,
DateHired date NULL ,
Salary decimal(15, 2) NULL DEFAULT 0 ,
CommissionRate float(24) NULL
);
CREATE TABLE Customers (
CustomerID int NOT NULL AUTO_INCREMENT PRIMARY KEY,
CustFirstName nvarchar (25) NULL ,
CustLastName nvarchar (25) NULL ,
CustStreetAddress nvarchar (50) NULL ,
CustCity nvarchar (30) NULL ,
CustState nvarchar (2) NULL ,
CustZipCode nvarchar (10) NULL ,
CustPhoneNumber nvarchar (15) NULL
);
CREATE TABLE Engagements (
EngagementNumber int NOT NULL AUTO_INCREMENT PRIMARY KEY,
StartDate date NULL ,
EndDate date NULL ,
StartTime time NULL ,
StopTime time NULL ,
ContractPrice decimal(15,2) NULL DEFAULT 0 ,
CustomerID int NULL DEFAULT 0 ,
AgentID int NULL DEFAULT 0 ,
EntertainerID int NULL DEFAULT 0
);
CREATE TABLE Engagements_Archive (
EngagementNumber int NOT NULL ,
StartDate date NULL ,
EndDate date NULL ,
StartTime time NULL ,
StopTime time NULL ,
ContractPrice decimal(15,2) NULL ,
CustomerID int NULL ,
AgentID int NULL ,
EntertainerID int NULL
);
CREATE TABLE Entertainer_Members (
EntertainerID int NOT NULL ,
MemberID int NOT NULL DEFAULT 0 ,
Status smallint NULL DEFAULT 0
);
CREATE TABLE Entertainer_Styles (
EntertainerID int NOT NULL ,
StyleID int NOT NULL DEFAULT 0
);
CREATE TABLE Entertainers (
EntertainerID int NOT NULL AUTO_INCREMENT PRIMARY KEY,
EntStageName nvarchar (50) NULL ,
EntSSN nvarchar (12) NULL ,
EntStreetAddress nvarchar (50) NULL ,
EntCity nvarchar (30) NULL ,
EntState nvarchar (2) NULL ,
EntZipCode nvarchar (10) NULL ,
EntPhoneNumber nvarchar (15) NULL ,
EntWebPage nvarchar (50) NULL ,
EntEMailAddress nvarchar (50) NULL ,
DateEntered date NULL ,
EntPricePerDay decimal(15,2) NULL
);
CREATE TABLE Members (
MemberID int NOT NULL AUTO_INCREMENT PRIMARY KEY,
MbrFirstName nvarchar (25) NULL ,
MbrLastName nvarchar (25) NULL ,
MbrPhoneNumber nvarchar (15) NULL ,
Gender nvarchar (2) NULL
);
CREATE TABLE Musical_Preferences (
CustomerID int NOT NULL DEFAULT 0 ,
StyleID int NOT NULL DEFAULT 0
);
CREATE TABLE Musical_Styles (
StyleID int NOT NULL AUTO_INCREMENT PRIMARY KEY,
StyleName nvarchar (75) NULL
);
CREATE INDEX AgtZipCode ON Agents(AgtZipCode);
CREATE INDEX CustZipCode ON Customers(CustZipCode);
CREATE INDEX AgentsEngagements ON Engagements(AgentID);
CREATE INDEX CustomerID ON Engagements(CustomerID);
CREATE INDEX EmployeeID ON Engagements(AgentID);
CREATE INDEX EntertainerID ON Engagements(EntertainerID);
ALTER TABLE Engagements_Archive
ADD CONSTRAINT Engagements_Archive_PK PRIMARY KEY
(
EngagementNumber
);
CREATE INDEX CustomerID ON Engagements_Archive(CustomerID);
CREATE INDEX EmployeeID ON Engagements_Archive(AgentID);
CREATE INDEX EntertainerID ON Engagements_Archive(EntertainerID);
ALTER TABLE Entertainer_Members
ADD CONSTRAINT Entertainer_Members_PK PRIMARY KEY
(
EntertainerID,
MemberID
);
CREATE INDEX EntertainersEntertainer_Members ON Entertainer_Members(EntertainerID);
CREATE INDEX MembersEntertainer_Members ON Entertainer_Members(MemberID);
ALTER TABLE Entertainer_Styles
ADD CONSTRAINT Entertainer_Styles_PK PRIMARY KEY
(
EntertainerID,
StyleID
);
CREATE INDEX EntertainersEntertainer_Styles ON Entertainer_Styles(EntertainerID);
CREATE INDEX Musical_StylesEntertainer_Styles ON Entertainer_Styles(StyleID);
CREATE INDEX EntZipCode ON Entertainers(EntZipCode);
ALTER TABLE Musical_Preferences
ADD CONSTRAINT Musical_Preferences_PK PRIMARY KEY
(
CustomerID,
StyleID
);
CREATE INDEX CustomerID ON Musical_Preferences(CustomerID);
CREATE INDEX StyleID ON Musical_Preferences(StyleID);
ALTER TABLE Engagements
ADD CONSTRAINT Engagements_FK00 FOREIGN KEY
(
AgentID
) REFERENCES Agents (
AgentID
),
ADD CONSTRAINT Engagements_FK01 FOREIGN KEY
(
CustomerID
) REFERENCES Customers (
CustomerID
),
ADD CONSTRAINT Engagements_FK02 FOREIGN KEY
(
EntertainerID
) REFERENCES Entertainers (
EntertainerID
);
ALTER TABLE Entertainer_Members
ADD CONSTRAINT Entertainer_Members_FK00 FOREIGN KEY
(
EntertainerID
) REFERENCES Entertainers (
EntertainerID
),
ADD CONSTRAINT Entertainer_Members_FK01 FOREIGN KEY
(
MemberID
) REFERENCES Members (
MemberID
);
ALTER TABLE Entertainer_Styles
ADD CONSTRAINT Entertainer_Styles_FK00 FOREIGN KEY
(
EntertainerID
) REFERENCES Entertainers (
EntertainerID
) ON DELETE CASCADE,
ADD CONSTRAINT Entertainer_Styles_FK01 FOREIGN KEY
(
StyleID
) REFERENCES Musical_Styles
(
StyleID
);
ALTER TABLE Musical_Preferences
ADD CONSTRAINT Musical_Preferences_FK00 FOREIGN KEY
(
CustomerID
) REFERENCES Customers (
CustomerID
) ON DELETE CASCADE,
ADD CONSTRAINT Musical_Preferences_FK01 FOREIGN KEY
(
StyleID
) REFERENCES Musical_Styles (
StyleID
);
Running this script results in the following error message:
16:33:35 CREATE DATABASE EntertainmentAgencyModify Error 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 'CREATE DATABASE EntertainmentAgencyModify' at line 1 0.00041
sec
Screenshot
I have tried running other scripts that came with the book that also starts with "CREATE DATABASE" and some of them ran smoothly without any errors, so I'm confused as to why I'm getting this error message. Any help would be greatly appreciated! Thanks all!
Note that since this script has a "CREATE DATABASE" at the top it will fail if that database already exists. That also means that if it works partially and you run it again, it;ll fail completely the next time. "CREATE DATABASE" is a pretty big hammer, so you probably don't want to get into the habit of doing it a lot. But, having said that, here's an even bigger hammer; add
DROP DATABASE IF EXISTS EntertainmentAgencyModify;
in front of the CREATE and similarly for the others. When you have real data, you, of course, never want to use either of these.
Can you try running the following just by typing it in your mysql console:
CREATE DATABASE EntertainmentAgencyModify;
It should simply work, or at least tell you something more then a syntax error.
The code executes fine. May be its a problem with your MySql.
Try to install a new MySql. :)
https://www.mysql.com/downloads/
Thanks everyone! I have no idea why this works, but I found a solution. I had to simply delete "CREATE " from the first line of the script and re-type it. Then it worked. If anyone has any idea why this seemingly irrelevant solution worked, I'd love to know. Thanks everyone for your help!
So I´ve looked trough the web in search for basic date help in sql and nobody seems to be able to help my codes goes like this
create table Hotel
(
id int not null primary key auto_increment,
Name varchar(255)
);
create table Gestur
(
id int not null primary key auto_increment,
nafn varchar(255),
heimili varchar(255),
simi char(7),
netfang varchar(255)
);
create table Bokun
(
id int not null primary key auto_increment,
ID_hotel_fk int references Hotel(id),
ID_gestur_fk int references Gestur(id),
dags_inn date null,
dags_ut date null,
tegund_herbergis char(1)
);
and I can´t seem to get this part right
insert into Bokun
(ID_gestur_fk,ID_hotel_fk,dags_inn,dags_ut,tegund_herbergis)
values
(1,3, 2015-10-25,2016-12-26,"1"),
(2,5, 2015-04-01, 2016-8-24,"3"),
(3,4, 2014-02-24, 2016-12-08,"1"),
(4,2, 2015-04-26, 2016-12-24,"2"),
(5,4, 2015-07-14, 2016-04-23,"1"),
(6,2, 2015-12-12, 2016-09-12,"3"),
(7,3, 2015-12-26, 2016-05-03,"2"),
(8,2, 2013-09-12, 2014-06-10,"1"),
(9,1, 2015-05-26, 2016-12-28,"1"),
(10,5, 2015-03-30, 2016-06-07,"4");
I only get the error
1292 - Incorrect date value: '1980' for column 'dags_inn' at row 1
You need to quote dates with ' and qoute "1" as '1':
insert into Bokun(ID_gestur_fk,ID_hotel_fk,dags_inn,dags_ut,tegund_herbergis)
values(1,3, '2015-10-25','2016-12-26','1');
2015-10-25 is treated as 1980 (aritmetic operation substraction)
SqlFiddleDemo
insert into Bokun
(ID_gestur_fk,ID_hotel_fk,dags_inn,dags_ut,tegund_herbergis)
values
(1,3, '2015-10-25','2016-12-26',"1"),
(2,5, '2015-04-01', '2016-8-24',"3"),
(3,4, '2014-02-24', '2016-12-08',"1"),
(4,2, '2015-04-26', '2016-12-24',"2"),
(5,4, '2015-07-14', '2016-04-23',"1"),
(6,2, '2015-12-12', '2016-09-12',"3"),
(7,3, '2015-12-26', '2016-05-03',"2"),
(8,2, '2013-09-12', '2014-06-10',"1"),
(9,1, '2015-05-26', '2016-12-28',"1"),
(10,5, '2015-03-30', '2016-06-07',"4");
you missed '(quotes).Thanks this helps..
CREATE TABLE person_details
( id NOT NULL AUTO_INCREMENT,
name varchar(100),
age int,
gender varchar(8),
adult varchar(10),
contact_no int,
address varchar(255),
pnr_number int
)
Error at Command Line:2 Column:15
Error report:
SQL Error: ORA-00907: missing right parenthesis
00907. 00000 - "missing right parenthesis"
*Cause:
*Action:
You forgot to define the type of id field here:
( id NOT NULL AUTO_INCREMENT,
Should be something like:
( id INT NOT NULL AUTO_INCREMENT,
^^^^
And make it as a primary key like
pnr_number int,
PRIMARY KEY (id)
So I have, table courses:
CREATE TABLE IF NOT EXISTS `AppDziennik`.`courses` (
`id_course` INT NOT NULL AUTO_INCREMENT ,
`name` VARCHAR(80) NOT NULL ,
`teachers_id_teacher` INT NOT NULL ,
`end_date` DATE NULL ,
`about` VARCHAR(255) NULL ,
`start_date` DATE NULL ,
PRIMARY KEY (`id_course`) ,
UNIQUE INDEX `id_course_UNIQUE` (`id_course` ASC) ,
CONSTRAINT `fk_courses_teachers1`
FOREIGN KEY (`teachers_id_teacher` )
REFERENCES `AppDziennik`.`teachers` (`id_teacher` )
ON DELETE NO ACTION
ON UPDATE NO ACTION)
ENGINE = InnoDB
and second table
CREATE TABLE IF NOT EXISTS `AppDziennik`.`teachers` (
`id_teacher` INT NOT NULL AUTO_INCREMENT ,
`name` VARCHAR(45) NOT NULL ,
`surname` VARCHAR(45) NOT NULL ,
`about` VARCHAR(255) NULL ,
`id_class` INT NULL ,
`rank` VARCHAR(45) NULL ,
`logins_id_login` INT NOT NULL ,
PRIMARY KEY (`id_teacher`) ,
INDEX `fk_teachers_classes1_idx` (`id_class` ASC) ,
INDEX `fk_teachers_logins1_idx` (`logins_id_login` ASC) ,
CONSTRAINT `fk_teachers_classes1`
FOREIGN KEY (`id_class` )
REFERENCES `AppDziennik`.`classes` (`id_class` )
ON DELETE NO ACTION
ON UPDATE NO ACTION,
CONSTRAINT `fk_teachers_logins1`
FOREIGN KEY (`logins_id_login` )
REFERENCES `AppDziennik`.`logins` (`id_login` )
ON DELETE NO ACTION
ON UPDATE NO ACTION)
ENGINE = InnoDB
When I make that insert
insert into appdziennik.courses
(name, id_teacher, about, start_date, end_date)
values ("Math",'7',"Math",'2013-08-01','2014-06-29');
I get that error:
Error Code: 1364. Field 'teachers_id_teacher' doesn't have a default
value
Where I made mistake? How i could fix it.
If you're sending an INSERT to table courses, there is no field id_teacher (you want teachers_id_teacher). Since you're using a foreign key, that key must exist in table teachers before you INSERT a record into table courses. Also, you should only be using backticks (`) and single quotes (') in all your statements.
you are trying to insert into the courses table for the column id_teacher a value but your not inserting a value for the column teachers_id_teacher. so I would propose to make the statement as followed:
insert into appdziennik.courses (name, teachers_id_teacher, about, start_date, end_date) values ("Math",'7',"Math",'2013-08-01','2014-06-29');
Sarajog