While trying to initialise a database in MySQl, we have ran into the same errors (1064 & 1146) numerous times and are out of ideas on how to correct it.
Here is what we have so far:
any help would be greatly appreciated.
Thank you.
You are using strings for table names,use back ticks.Also you have foreign keys referencing different column types,they must be the same type and size.Also referenced column must have primary or unique key.
Here it is,but I don't think this is a correct design.
SQL Fiddle
Just missing commas:
CREATE TABLE 'Customer' (
customerCode VARCHAR(5) PRIMARY KEY,
firstName VARCHAR(20) NOT NULL,
lastName VARCHAR(20)NOT NULL,
pointsTotal VARCHAR(5)
)ENGINE=INNODB;
CREATE TABLE 'GameList' (
gameCode INT PRIMARY KEY AUTO_INCREMENT,
gameName VARCHAR(25) NOT NULL,
consoleName VARCHAR(25) NOT NULL,
pointsValue VARCHAR(25) NOT NULL
)ENGINE=INNODB;
And last select should be like:
SELECT custCode,
SUM(points) as pointsTotal from CustomerHistory
GROUP BY custCode;
Your last SELECT has too many commas, it should be something like
SELECT custCode, SUM(points) as pointsTotal
FROM CustomerHistory
GROUP BY custCode;
Related
CREATE TABLE sales (
ID INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
[Item Type] VARCHAR(30) NULL,
[Sales Channel] VARCHAR(30) NULL,
[Order Priority] VARCHAR(30) NULL,
[Order Date] DATE NULL,
[Order ID] DECIMAL NULL,
[Ship Date] DATE NULL
)
Dear guys, please with how to use as right syntax for the table columns: e.g. Item Type - here "type" already existing in mysql, Sales Channel - here "channel" already exists in mysql as operator names. but i need to use as column names for the table. Thanks!
There are different ways to do this.
You could use double quotes (") to escape the reserved keyword.
You could use back-ticks (`)
You could prepend with schema name (only for tables) e.g.
myschema.Table.
A good reference is here
If the table name or column name is a keyword or it contains spaces, and you still want to use that name, quote them between backticks '`'. So your query should look like:
CREATE TABLE sales (
ID INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
`Item Type` VARCHAR(30) NULL,
`Sales Channel` VARCHAR(30) NULL,
`Order Priority` VARCHAR(30) NULL,
`Order Date` DATE NULL,
`Order ID` DECIMAL NULL,
`Ship Date` DATE NULL
);
Try it yourself at SQL Fiddle: http://sqlfiddle.com/#!9/0332f0
Fix your column names so they do not have to be escaped! This will make all subsequent work much simpler:
CREATE TABLE sales (
SalesID INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
ItemType VARCHAR(30) NULL,
SalesChannel VARCHAR(30) NULL,
OrderPriority VARCHAR(30) NULL,
OrderDate DATE NULL,
OrderID DECIMAL NULL,
ShipDate DATE NULL
);
I recommend using the table name for the id. In addition, you are using DECIMAL with no precision or scale. Highly UNRECOMMENDED. Don't depend on database defaults (do you even know what they are?).
You should also include foreign key references. So you should have a foreign key constraint to the orders table.
I have two tables one is a customer table and the second is sales table.
I need to create a query to display customer name, customer_id and number of Gadgets bought (write two queries using different syntaxes of JOIN). Example : “John Barry - 111 bought 5 gadgets”.
CUSTOMERS_JS
create table CUSTOMERS_JS (
CUSTID smallint not null,
CUSTNAME char(50) not null,
primary key(CUSTID)
);
STORE_SALES_JS
create table STORE_SALES_JS (
SALEID smallint not null,
SALETS datetime not null,
GADGETID smallint not null,
EMPID smallint not null,
CUSTID smallint not null,
primary key(SALEID),
foreign key(GADGETID) references ELEC_items_JS(GADGETID),
foreign key(EMPID) references Store_EMPS_JS(EMPID),
foreign key(CUSTID) references CUSTOMERS_JS(CUSTID)
);
I did this query
select concat(CUSTNAME,' - ',STORE_SALES_JS.CUSTID,' bought ',count(STORE_SALES_JS.GADGETID),' gadgets') as result
from CUSTOMERS_JS,STORE_SALES_JS
where STORE_SALES_JS.CUSTID = CUSTOMERS_JS.CUSTID
group by STORE_SALES_JS.CUSTID,CUSTNAME
order by STORE_SALES_JS.CUSTID
but there is too much space between the name and the '-'. I tried to change the name field to varchar and it worked as it supposed to work but I need it to work with char(50) as well.
Thanks to scaisEdge help I managed to fix this issue while using rtrim function
select concat(rtrim(CUSTNAME),' - ',STORE_SALES_JS.CUSTID,' bought ',count(STORE_SALES_JS.GADGETID),' gadgets') as result
from CUSTOMERS_JS,STORE_SALES_JS
where STORE_SALES_JS.CUSTID = CUSTOMERS_JS.CUSTID
group by STORE_SALES_JS.CUSTID,CUSTNAME
order by STORE_SALES_JS.CUSTID
if you must use char and not varchar but need a trimmed result in your select you could trim ( or rtrim or ltrim) your custname for remove the spaces
select concat(rtrim(CUSTNAME),' - '
,STORE_SALES_JS.CUSTID,' bought '
,count(STORE_SALES_JS.GADGETID),' gadgets') as result
from CUSTOMERS_JS,STORE_SALES_JS
where STORE_SALES_JS.CUSTID = CUSTOMERS_JS.CUSTID
group by STORE_SALES_JS.CUSTID,CUSTNAME
order by STORE_SALES_JS.CUSTID
I'm a totally MySQL newcomer. Sr if my question is quite obvious. I got 2 tables
CREATE TABLE tbl_addresses(
PK_ADDRESS_ID int NOT NULL AUTO_INCREMENT,
house_number int NOT NULL,
street varchar(35),
district varchar(35),
city varchar(35),
postcode varchar(8),
PRIMARY KEY (PK_ADDRESS_ID)
);
CREATE TABLE tbl_people(
PK_PERSON_ID int NOT NULL AUTO_INCREMENT,
title varchar(6) NOT NULL, # Master / Mister therefor 6 is max
forename varchar(35) NOT NULL,
surname varchar(35) NOT NULL,
date_of_birth DATE NOT NULL,
contact_number varchar(12) NOT NULL,
FK_ADDRESS_ID int NOT NULL,
PRIMARY KEY (PK_PERSON_ID),
FOREIGN KEY (FK_ADDRESS_ID) REFERENCES tbl_addresses (PK_ADDRESS_ID)
);
and I'm trying to import data into these tables from Java using below syntaxes
INSERT INTO tbl_addresses (house_number,street,district,city,postcode) VALUES ('1','abc','','abc','abc');
INSERT INTO tbl_people (title,forename,surname,date_of_birth,contact_number) VALUES ('Mr','Tri ','Nguyen','1991-1-1','0123456789');
I got an error Field 'FK_ADDRESS_ID'doesn't have a default value and data actually goes into tbl_addresses but not tbl_people. Am I missing anything? Thanks in advance!
This error is being caused by that you labelled the FK_ADDRESS_ID field in the tbl_people table as NOT NULL, yet you are trying to do an INSERT without specifying a value for this column.
So something like this would work without error:
INSERT INTO tbl_people (title, forename, surname, date_of_birth,
contact_number, FK_ADDRESS_ID)
VALUES ('Mr', 'Tri', 'Nguyen', '1991-1-1', '0123456789', 1);
You could also specify a default value for FK_ADDRESS_ID (the error message you got alluded to this). Here is how you could adda default value:
ALTER TABLE tbl_people MODIFY COLUMN FK_ADDRESS_ID int NOT NULL DEFAULT 1
But because FK_ADDRESS_ID is a key into another table, the value should really be based on the primary key in tbl_addresses.
The fact that you are using a foreign key isn't the reason that you are getting this error. Let's take a look at your column definition.
FK_ADDRESS_ID int NOT NULL,
This is not null but does not a default. Now a look at your insert statement
INSERT INTO tbl_people (title,forename,surname,date_of_birth,contact_number)
FK_ADDRESS_ID isn't in your column list but it cannot be null and doesn't have a default so what can mysql do? Produce an error of course.
The best bet is to define that column as nullable.
Let's revisit the foreign key constraint.
FOREIGN KEY (FK_ADDRESS_ID) REFERENCES tbl_addresses (PK_ADDRESS_ID)
What this really says is that if you asign a value to FK_ADDRESS_ID that value should be present in PK_ADDRESS_ID column in tbl_address
as a side note, it's customary to use lower case for table/column names.
I keep getting the error code 'ORA-02270' and no matter what I try, I can't seem to fix it. Below are my Create Table statements:
CREATE TABLE student
(
studentID CHAR(8) PRIMARY KEY,
studentName VARCHAR(25) NOT NULL,
studentAddress VARCHAR(30) NOT NULL,
studentDOB DATE NOT NULL,
studentGender CHAR(1) NOT NULL CHECK ((studentGender = 'F') OR (studentGender = 'M')),
studentNationality VARCHAR(15) NOT NULL,
studentCourse VARCHAR(30) NOT NULL,
studentSemesterExcellent CHAR(1) NOT NULL CHECK ((studentSemesterExcellent = 'Y') OR (studentSemesterExcellent = 'N'))
);
CREATE TABLE leaseAgreement
(
leaseNo CHAR(6) PRIMARY KEY,
studentID CHAR(8) NOT NULL,
leaseAccommodationType VARCHAR2(10) NOT NULL,
leaseDuration NUMBER NOT NULL,
leaseStartDate DATE NOT NULL,
leaseEndDate DATE,
studentSemesterExcellent CHAR(1) NOT NULL CHECK ((studentSemesterExcellent = 'Y') OR (studentSemesterExcellent = 'N')),
FOREIGN KEY (studentID) REFERENCES student(studentID),
FOREIGN KEY (studentSemesterExcellent) REFERENCES student(studentSemesterExcellent)
);
Am I not allowed to have two foreign keys from the same table? Please can someone explain this error and point me in the right direction. Thank you.
First, the answer from mustaccio is correct.
The column 'studentSemesterExcellent' in table 'student' is no key column. You can not reference it in a foreign key constraint.
And if you make it unique you can only have two rows in the student table, not what you are intending.
Second, you have tagged the question both with MySQL and Oracle. Choose one!
Third, you only need one FK if it is a not null column. Don't make it harder on yourself.
Fourth, if this is Oracle database, the advice is to only use varchar2() for string data. The char and varchar datatypes exist for compatibility reasons.
I would like to create some tables in MySQL. One table would be for users, one for topics, one for comments, and so on.
I need each table to have its own ID column in the following format:
USERS table: ID column
Values:
USR00001
USR00002
USR00003
..
..
USR99999
where as topics table would have IDs like:
TPC00001
TPC00002
TPC00003
similarly, the comments table would have the following IDs:
CMT00001
CMT00002
I tried to use UNIQUE key but did not work: (inspired by this answer)
CREATE TABLE `users` (
`ID` BIGINT(20) UNSIGNED NOT NULL AUTO_INCREMENT ,
`firstname` VARCHAR(100) NOT NULL ,
`lastname` VARCHAR(100) NOT NULL ,
`email` VARCHAR(100) NOT NULL ,
PRIMARY KEY (`ID`)
UNIQUE KEY ( 'USR' + `ID`)
);
Can it be done using triggers (Before Insert) maybe?
Please note that I don't want to handle the insertion of the primary keys on the application level. I would prefer the database engine to handle all the work for that.