This question already has answers here:
When to use single quotes, double quotes, and backticks in MySQL
(13 answers)
Closed 4 years ago.
I trying to delete an entry from a table in mysql the table is for publications This is the table.
CREATE TABLE publication(pub_id VARCHAR(4) NOT NUll,
price DECIMAL(3, 2) NOT NULL,
name VARCHAR(20) NOT NULL,
frequency INTEGER(10) NOT NULL,
PRIMARY KEY(pub_id) );
This is the table with added entries
The query i'm using is
Delete from publication where pub_id = P001;
I get an error "Unknown column 'P001' in where clause"
What am I doing wrong?
If you don't use quotes, it will try to find a column|other object named P001. Try
delete from publication where pub_id = 'P001';
please check manual Mysql
correct:
Delete from publication where pub_id = 'P001';
check the manual and sintaxis here
Related
This question already has answers here:
Syntax error due to using a reserved word as a table or column name in MySQL
(1 answer)
When to use single quotes, double quotes, and backticks in MySQL
(13 answers)
Closed last year.
I am trying to create a table in MySQL, but I am getting an error. The code is looking OK to me, but I don't know why I am getting the error.
This is the code :
CREATE TABLE usage (
user_id VARCHAR(20) ,
usage_date DATE ,
usage_location VARCHAR(20) ,
time_spent INT
);
The error that I am getting:
Query 1: 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 'usage (
user_id VARCHAR(20) ,
usage_date DATE ,
usage_locatio' at line 1
try using some other names like usage1 for datausage because that is reserved
CREATE TABLE stuffusage (
user_id VARCHAR(20) ,
usage_date DATE ,
usage_location VARCHAR(20) ,
time_spent INT
);
Try putting backticks around usage. It seems to be a keyword.
CREATE TABLE `usage` (
user_id VARCHAR(20) ,
usage_date DATE ,
usage_location VARCHAR(20) ,
time_spent INT
);
"usage" cannot be used as a table name. It is a special code defined in MYSQL.
This question already has answers here:
CHECK constraint in MySQL is not working
(8 answers)
Closed 2 years ago.
i've created this table in SQL
CREATE TABLE product (
code CHAR(7) NOT NULL,
name VARCHAR(30) NOT NULL,
Description VARCHAR(500) NOT NULL,
cost DOUBLE UNSIGNED NOT NULL,
PRIMARY KEY (code),
check(substring(code,1,3) like '%[a-z]%'
and substring(code,4,4) like '%[0-9]%'),
);
the value 'code' must consist of 3 characters and 4 numbers, but it doesn't work. what's wrong in the check?
the value 'code' must consist of 3 characters and 4 numbers, but it doesn't work. what's wrong in the check?
Use regular expressions:
check (code regexp '^[A-Z]{3}[0-9]{4}$')
MySQL does not extend the definition of LIKE to include character classes. It has real regular expression support.
This question already has an answer here:
Syntax error due to using a reserved word as a table or column name in MySQL
(1 answer)
Closed 5 years ago.
It doesn't like the word release as a column name.
CREATE TABLE external_db (
external_db_id INT not null,
db_name VARCHAR(100) NOT NULL,
release VARCHAR(40) NOT NULL,
status ENUM ('KNOWNXREF','KNOWN','XREF','PRED','ORTH', 'PSEUDO') not null,
PRIMARY KEY( external_db_id )
);
I changed the field name to releaseX and the error went away.
This script came from https://github.com/Ensembl/ensembl/blob/release/91/sql/table.sql, which is supposed to be mySQL. Is this a versioning issue in MySQL or can I decorate the word release in the script so it can be used as a column name?
I am using MySQL 5.7 and MySQLWorkbench 6.3.
I know release is a bad name for a column but I didn't write the script.
Release is a reserved keyword
To use it as a column name, you can escape it with backticks like this:
`release`
This question already has answers here:
When to use single quotes, double quotes, and backticks in MySQL
(13 answers)
Closed 5 years ago.
I can't for the life of me figure out what's wrong with this query:
CREATE TABLE IF NOT EXISTS 'plaintext' (
'id' INT NOT NULL AUTO_INCREMENT,
'name' VARCHAR NOT NULL,
'text' TEXT NOT NULL,
PRIMARY KEY ('id')
)
I am running MySQL version 5.7.14 on WAMP. I am getting this error:
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 ''id' INT NOT
NULL AUTO_INCREMENT, 'name' VARCHAR NOT NULL, 'text' TEX' at line 2
When trying out the query in phpmyadmin it told me that a symbol name and column definition was expected near 'id' on line 2, and there is an unexpected beginning of a statement near 'id' at line 5.
No clue what this even means to be completely honest with you, I'm quite new to MySQL.
Thanks in advance!
David
I think that the issue is that you are not providing a size for your VARCHAR
CREATE TABLE IF NOT EXISTS 'plaintext' (
'id' INT NOT NULL AUTO_INCREMENT,
'name' VARCHAR(100) NOT NULL,
'text' TEXT NOT NULL,
PRIMARY KEY ('id')
)
This question already has answers here:
How do I escape reserved words used as column names? MySQL/Create Table
(4 answers)
Closed 6 years ago.
I would like to create a table with GENERATED as column in MySQL version 5.7.16. When I try below query it is giving error:
create table madhu (RECORDID VARCHAR(255) NOT NULL, GENERATED INTEGER NOT NULL);
Below is the error:
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 'GENERATED INTEGER NOT NULL)' at line 1 0.000 sec
It looks GENERATED is reserved key word. Is there away to have GENERATED as column? If I change the column it works anyway.
To escape reserved keywords use backticks or choose a different column name.
create table madhu
(
RECORDID VARCHAR(255) NOT NULL,
`GENERATED` INTEGER NOT NULL
);