I have a table with a DATETIME column.
I would like to SELECT this datetime value and INSERT it into another column.
I did this (note: '2011-12-18 13:17:17' is the value the former SELECT gave me from the DATETIME field):
UPDATE products SET former_date=2011-12-18 13:17:17 WHERE id=1
and get
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 '13:17:17 WHERE itemid=1' at line 1
Ok, I understand it's wrong to put an unquoted string in there, but is DATETIME just a string in the first place?
What do I put in there?
All I want is reliably transfer the existing value over to a new datetime field...
EDIT:
The reason I ask is: I have this special definition, DATETIME, and somehow I thought it gives me some security and other advantages when handling dates. Now it seems it is simply a specialized VARCHAR, so to speak.
Thanks for your answers, it seems this is indeed the intended behaviour.
According to MySQL documentation, you should be able to just enclose that datetime string in single quotes, ('YYYY-MM-DD HH:MM:SS') and it should work. Look here: Date and Time Literals
So, in your case, the command should be as follows:
UPDATE products SET former_date='2011-12-18 13:17:17' WHERE id=1
Try
UPDATE products SET former_date=20111218131717 WHERE id=1
Alternatively, you might want to look at using the STR_TO_DATE (see STR_TO_DATE(str,format)) function.
for MYSQL try this
INSERT INTO table1(myDatetimeField)VALUES(STR_TO_DATE('12-01-2014 00:00:00','%m-%d-%Y %H:%i:%s');
verification-
select * from table1
output- datetime= 2014-12-01 00:00:00
If you don't need the DATETIME value in the rest of your code, it'd be more efficient, simple and secure to use an UPDATE query with a sub-select, something like
UPDATE products SET t=(SELECT f FROM products WHERE id=17) WHERE id=42;
or in case it's in the same row in a single table, just
UPDATE products SET t=f WHERE id=42;
Related
I code in the SQL, but I want to change the date format from default of My SQL to different format "DD/MM/YYYY" to use this format to code, but I recieved an error.
More about version of SQL:
SQL: My SQL Workbench 8.0.30 build 2054668
Window 11 Pro
Language: English
So, how can I change the date format or what is the true type of "dmy"? Please help me.
This is code that I used:
set dateformat dmy
And error is:
"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 'dmy' at line 1"
At the moment, we don't really know the reason why you want to change the date format, but I have a couple of assumption:
You want to insert date data from front end into the table but couldn't do so due to the mismatched date format.
You want the end output to show the date format of DD/MM/YYYY instead.
Although, it may look like you need to change the table column date format, there's a way to avoid that operation entirely. However, since you've mentioned changing from YYYY/MM/DD in your title, I'm not sure if your date column is actually DATE datatype because the default MySQL should be YYYY-MM-DD. Nonetheless, I'll address the matter in this answer altogether.
Modify the date format in query and leave the table date column datatype as it is:
From DD\MM\YYYY to MySQL DATE datatype format YYYY-MM-DD
... STR_TO_DATE(data, '%d/%m/%Y')
.. from YYYY-MM-DD to DD/MM/YYYY
... DATE_FORMAT(data, '%d/%m/%Y')
You can use any of that anywhere in a query; whether in SELECT or WHERE.
If "in query" is not what you want and you still want to update the table:
Well, you have two options here:
Directly modify the column datatype then update the value:
ALTER TABLE mytable MODIFY COLUMN date_col VARCHAR(255);
UPDATE mytable SET date_col =DATE_FORMAT(date_col , '%d/%m/%Y');
Or you can add another column, populate the desired date format there and keep the original date column as it is:
ALTER TABLE mytable ADD COLUMN my_date VARCHAR(255);
UPDATE mytable SET my_date =DATE_FORMAT(date_col , '%d/%m/%Y');
this way you have the option to directly use MySQL date functions on the default MySQL date column without the hassle of converting your desired date format into the default before you can use date functions. What I'm saying is something like this:
DAY(mysql_default_dateformat)
is similar to
DAY(STR_TO_DATE(your_dateformat, '%d/%m/%Y'))
which means that you can use DAY() (date function) on the default date format directly without the need to convert what is not default first.
Here's demo fiddle examples
We are storing datetime in a column on our MySQL database, formatted in TEXT, but when our datetime is supposed to look like below:
'xxxx-xx-xx 00:00:00'
The time is deleted or not show on our datetime, and therefore our datetime, at that specific time, only contains the date:
'xxxx-xx-xx'
What we want is first of all to figure out why this is occurring, but for now we need to edit every row, and make sure the datetime is also showing the time. We have tried to change the impacted rows by using this query:
UPDATE table SET TIME(col_datetime) = '00:00:00' WHERE LENGTH(TIME(col_datetime)) = 0;
Above query should update the time on the datetime for col_datetime, where length of time is 0. Unfortunately, we receive an error, and we can't run the query. This is the 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 '(time_start) = '00:00:00' WHERE LENGTH(TIME(time_start)) = 0' at line 2
How can we change time on our datetime, where time is not shown?
Don't store dates as strings. Instead, you want to use the datetime datatype: it has a time part, that defaults to 00:00:00 when not specified.
Here is a small conversion script for that purpose:
alter table mytable add col_datetime_new datetime;
update mytable set col_datetime_new = col_datetime;
alter table mytable drop col_datetime;
alter table mytable change column col_datetime_new col_datetime datetime;
This leverages the fact that you are using format YYYY-MM-DD in your string dates, so conversion to datetime is seemless.
I have a table ABC that has many columns, two of which are:
ID - VARCHAR(10) and ROLE VARCHAR(10).
Now I have been trying to update the column ROLE using the ID and this is the query:
UPDATE TABLE ABC
SET ROLE='READ_ONLY'
WHERE ID='AB234PQR'
Now for some unknown reason, i have been getting the error - truncated incorrect integer value. I have no idea where I am going wrong.I have been banging my head over this for a while now.
I have visited other questions with the similar title.All use convert or some other function in where clause, But I have not used any such thing, still it gives me the same error.
I checked the table description and it seems fine. Where can I be going wrong? Any help is appreciated.
Can you please try this:
UPDATE ABC
SET ROLE='READ_ONLY'
WHERE ID='AB234PQR'
The correct syntax to update table entries is:
UPDATE `table_name`
SET `column_name` = 'value'
WHERE `column_name2` = 'value2';
It is as well recommended to use backticks around table names and column names, just like the way you can see in my snippet above.
Therefore using
UPDATE `ABC`
SET `ROLE` = 'READ_ONLY'
WHERE `ID` = 'AB234PQR'
should do the trick.
I'm fairly new to using triggers and have a tiny question.
I have a trigger finds a match between a newly inserted enquiry and a customer table.
INSERT INTO customersmatched (customerID,enquiryID) SELECT id, NEW.id FROM customer AS c WHERE c.customerName=NEW.companyName HAVING COUNT(id)=1;
I then need to update the newly inserted enquiry so it has a status which shows it's matched (but only if it has matched). So I tried adding this line after the insert.
UPDATE enquiry SET status="Live-Enquiry" WHERE id IN ( SELECT enquiryID FROM customersmatched WHERE enquiryID = NEW.id);
Except I get this error:
MySQL said: #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 'UPDATE enquiry SET status="Live-Enquiry" WHERE id
IN ( SELECT enquiryID FROM cus' at line 5
How do I allow multiple queries within a trigger. I've tried doing something like in this link: Multiple insert/update statements inside trigger?
But doesn't work either. I'm using phpmyadmin btw. Can anyone help? :D
If you have ansi quotes enabled then you can't use double quotes as a string literal, and need to use single quotes instead. see: http://dev.mysql.com/doc/refman/5.7/en/sql-mode.html#sqlmode_ansi_quotes Otherwise, I don't see any syntax errors that jump out at me.
Try changing SET status="Live-Enquiry" to SET status='Live-Enquiry'
EDIT:
What is the purpose of the first query? I'm not sure you need the HAVING in that query. If want a distinct list of matches, just use DISTINCT
INSERT INTO customersmatched (customerID,enquiryID)
SELECT DISTINCT id, NEW.id
FROM customer AS c
WHERE c.customerName=NEW.companyName;
The second query, if I understand it correctly, can be simplified to this:
UPDATE enquiry
SET status='Live-Enquiry'
WHERE id = NEW.id;
I'm attempting to insert a datetime('2013-08-30 19:05:00') value into a SQL server database table column(smalldatetime) and the value stays "NULL" after the insert.
I'm doing this to 6 other columns that are the exact same type. What is this only occuring on one column? I've triple checked that the names of the columns are correct. Any ideas?
Assuming the situation is as you describe
CREATE TABLE T
(
S SMALLDATETIME NULL
)
INSERT INTO T
VALUES('2013-08-30 19:05:00')
SELECT *
FROM T /*Returns NULL*/
There are only two ways I can think of that this can happen.
1) That is an ambiguous datetime format. Under the wrong session options this won't cast correctly and if you have some additional options OFF it will return NULL rather than raise an error (e.g.)
SET LANGUAGE Italian;
SET ansi_warnings OFF;
SET arithabort OFF;
INSERT INTO T
VALUES('2013-08-30 19:05:00')
SELECT *
FROM T /*NULL inserted*/
2) You may have missed the column out in an INSTEAD OF trigger, or have an AFTER trigger that actually sets the value back to NULL.