I have a column of dates written as strings with "am" and "pm" at the end, for example:
1/1/2016 12:00:00.000 AM
The type of the column is currently varchar, I want to change the type to datetime format.
Attempt 1
Changing the column type from phpmyadmin dashboard gives the following error:
Query error:
#1292 - Incorrect datetime value: '1/1/2016 12:00:00.000 AM'
Attempt 2
Considering the format of the date, I tried to use the STR_TO_DATE function. But it does not give the expected result. It instead returns the same date for each row.
SELECT STR_TO_DATE(`assembling-machine-tag`.`Time`, "%Y") from `assembling-machine-tag`
Result
So, how can I change the format of my column from varchar (with format = dd/mm/yy hh:mm:ss.ms AM) to datetime (with format = yyyy-mm-dd hh:mm:ss) in MySQL 7.4.1?
You just need to use the correct pattern:
SELECT STR_TO_DATE('1/2/2016 01:02:03.456 AM', '%e/%c/%Y %h:%i:%s.%f %p')
-- 2016-02-01 01:02:03.456000
In order to convert varchar data to datetime, you first need to create a temporary datetime column and update it like so:
UPDATE t SET `datetimetemp` = STR_TO_DATE(`varchardate`, '%c/%e/%Y %h:%i:%s.%f %p')
Once satisfied with result drop, the varchar column and rename the temporary column.
I would use this version:
SELECT STR_TO_DATE('1/1/2016 12:00:00.000 PM', '%d/%m/%Y %h:%i:%s.%f %p')
Related
The default date format in my SQL is : '2019-05-06'
and its fine but when i insert date to my table i want this format 2019-5-6 not the above format
It means month and day must be start 1 to 30 not 01 to 31.Is there any way to change default format in my sql?
You seem to be looking for the MySQL STR_TO_DATE function :
It takes a string str and a format string format. STR_TO_DATE() returns a DATETIME value if the format string contains both date and time parts, or a DATE or TIME value if the string contains only date or time parts.
So if the date coming out of your application is like '2019-5-6', to convert it to a MySQL date you need :
STR_TO_DATE('2019-5-6', '%Y-%c-%e')
In an INSERT statement :
INSERT INTO mytable VALUES(1, STR_TO_DATE('2019-5-6', '%Y-%c-%e'));
Tip :
%Y : Year as a numeric, 4-digit value
%c : numeric month name (0 to 12)
%e: day of the month as a numeric value (0 to 31)
The default way to store a date in a MySQL database is by using DATE. The proper format of a DATE is: YYYY-MM-DD. If you try to enter a date in a format other than the Year-Month-Day format, it might work but it won't be storing the dates as you expect.
In order to run a MySQL Insert command and add the current date into your table you can use MySQL's built-in function CURDATE() in your query.
An example of how to Insert a Date in MySQL using CURDATE
$query_auto = "INSERT INTO tablename (col_name, col_date) VALUE ('DATE: Auto CURDATE()', CURDATE() )";
Also, you can run a query to set the date manually
An example of how to Insert a Date in MySQL manually
$query_manual = "INSERT INTO tablename (col_name, col_date) VALUES ('DATE: Manual Date', '2008-7-04')";
It is recommended to do the date formatting when doing a query, like so:
SELECT DATE_FORMAT(BirthDate, "%W %M %e %Y") FROM Employees;
You can find more examples of formatting the date here:
https://www.w3schools.com/sql/func_mysql_date_format.asp
How to insert this date format on my table: 30/12/2018?
If it's impossible, then how can i turn this date format: 2018-12-30 12:10:00 to 30/12/2018 on a echo?
Store the date/time in the native format (i.e. as a datetime or date). Then, use date_format() to convert it to the format you want on output:
select date_format(datecol, '%d/%m/%Y')
You should proceed as follows :
ensure that the field where you store the date is of type datetime or date
use function STR_TO_DATE to convert strings to dates before writing to database
use function DATE_FORMAT to format the datetime values to the relevant format when reading form database.
Here is a small example of CREATE/INSERT/SELECT :
CREATE TABLE mytable (
mydate datetime
);
INSERT INTO mytable
VALUES (STR_TO_DATE('30/12/2018', '%d/%m/%Y'));
SELECT DATE_FORMAT(mydate, '%d/%m/%Y')
FROM mytable;
In mysql database,column name created.This "created " column is text datatype,I need to change this to datetime.Now this column have so many datas.Is it possible to convert it or?
Database look like
created
18-11-15 18:21:25
Expecting ouput is
created
2018-11-15 18:21:25
When am doing
ALTER TABLE invoices MODIFY created datetime
This query giving wrong data.its converting from 15-09-18 03:03:43 to 2015-09-18 03:03:43
If the original data is not in MySQL Datetime format (YYYY-MM-DD HH:MM:SS), you cannot just change the column datatype from Varchar/Text to Date/Datetime. Otherwise, there will be an irreparable Data loss.
This will be a multi-step process. You will first need to convert the date string to MySQL date format (YYYY-MM-DD HH:MM:SS). We can use STR_TO_DATE() function for this.
Your sample date string (18-11-15 18:21:25) is basically in %y-%m-%d %T format. Following format specifiers can be used:
%d Day of the month as a numeric value (01 to 31)
%m Month name as a numeric value (00 to 12)
%y Year as a numeric, 2-digit value
%T Time in 24 hour format (hh:mm:ss)
The query to update the date would look as follows:
UPDATE invoices
SET created = STR_TO_DATE(created, '%y-%m-%d %T');
Now, you can use Alter Table to change the data type from Text type to Datetime.
ALTER TABLE invoices
MODIFY COLUMN created datetime;
The best thing to do here is to not store your dates as text. Assuming you have already done this, we can cope by calling STR_TO_DATE to generate a bona fide date:
SELECT
STR_TO_DATE(created, '%y-%m-%d %h:%i:%s') AS created_out
FROM yourTable;
Since the output you expect is standard date output, we can stop here and avoid also calling DATE_FORMAT to generate a different output.
you want to convert output or database records ? for second you can use sql query :
UPDATE 'table_name' SET 'created' = CONCAT('20', 'created')
You will need first to interchange the day with the year in the created column, as follows:
UPDATE invoices
SET created = CONCAT(SUBSTR(created, 7, 2), '-', SUBSTR(created, 4, 2), '-', SUBSTR(created, 1, 2));
Then, you convert the column to DATETIME, as follows:
ALTER TABLE invoices MODIFY created DATETIME;
Hope this helps.
I have my sql database which have a field date and its type is varchar,I want to convert it into the Date but i have a lot of record in this field.
Kindly guide me how i can covert it into Date type without loosing my data.
It's looking like : 20-10-2018
But i want to change the date column varchar type to Date.
Thanks.
You will first need to convert the date string (varchar) to MySQL date format (YYYY-MM-DD). We can use STR_TO_DATE() function for this.
Your sample date string (20-10-2018) is basically in dd-mm-yyyy format. Following format specifiers can be used:
%d Day of the month as a numeric value (01 to 31)
%m Month name as a numeric value (00 to 12)
%Y Year as a numeric, 4-digit value
The query to update the date would look as follows (DB Fiddle DEMO):
UPDATE your_table_name
SET date_column_name = STR_TO_DATE(date_column_name, '%d-%m-%Y');
Now, you can use Alter Table to change the data type from varchar to date.
ALTER TABLE your_table_name
MODIFY COLUMN date_column_name date;
I have a table which is populated with data from an external source. The problem is I am getting two different format of dates for the same column, there are some records in '%Y-%m-%d %H:%i' format and other in '%Y-%d-%m %H:%i%s' format and they are all VARCHAR type.
I know how to convert a string type date field to a date/datetime field but how do I handle discrepancies in the way the dates are coming? Is it possible to Update dates on the basis of their individual format, so that I can apply a WHERE condition for updates to take place ONLY WHERE date_field is of '%Y-%m-%d %H:%i' format, and then another query to make updates for date field in '%Y-%d-%m %H:%i%s' format?
Right now when I try updating the tables with a common query I get error for the fields which donot match the format:
UPDATE my_table
SET my_date_field = STR_TO_DATE(my_date_field,'%Y-%m-%d %H:%i:%s');
RESPONSE: Error Code: 1411. Incorrect datetime value: '10-22-12 15:00' for function str_to_date
UPDATE my_table
SET my_date_field = STR_TO_DATE(my_date_field,'%Y-%d-%m %H:%i');
RESPONSE: Error Code: 1292. Truncated incorrect datetime value: '2010-01-01 00:00:00'
for this value 10-22-12 15:00 you should use, %y-%d-%m %H:%i
while for 2010-01-01 00:00:00, it should be %Y-%m-%d %H:%i:%s
so your query will use CASE
UPDATE my_table
SET my_date_field = (CASE WHEN CHAR_LENGTH(my_date_field) = 14
THEN STR_TO_DATE(my_date_field,'%y-%d-%m %H:%i')
ELSE STR_TO_DATE(my_date_field,'%Y-%m-%d %H:%i:%s')
END)
See SQLFiddle Demo
Other Source
DATE Formats
you can not update like that because if there is data in that column and it is of different type then you can not update table column so you should delete the column or make a procedure for that in that you can check and the replace or update table.