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You want to use STR_TO_DATE to first convert the incorrect string to a real date object, then use DATE_FORMAT to turn it back into a string of the format you want. Also, your WHERE condition won't work like that.
The format of a DATE value is 'YYYY-MM-DD'. According to standard SQL, no other format is permitted. You should use this format in UPDATE expressions and in the WHERE clause of SELECT statements. For example: SELECT * FROM t1 WHERE date >= '2003-05-05';
24 gru 2016 · SELECT CAST('2016-12-4' AS DATE);--> 2016-12-04, so you don't need str_to_date. I would add a new column for the date (ALTER TABLE .. ADD COLUMN ..); UPDATE to set the new column. Then manually fix any really messed up values. Finally DROP COLUMN and RENAME COLUMN; ORDER BY a VARCHAR that contains a date in it may lead wrong answers. (Jan and ...
In a MySQL database, the DATE_FORMAT() function allows you to display date and time data in a changed format. This function takes two arguments. The first is the date/datetime to be reformatted; this can be a date/time/datetime/timestamp column or an expression returning a value in one of these data types.
The DATE_FORMAT() function accepts two arguments: date : is a valid date value that you want to format. format : is a format string that consists of predefined specifiers. Each specifier is preceded by a percentage character ( % ). See the table below for a list of predefined specifiers.
Definition and Usage. The STR_TO_DATE () function returns a date based on a string and a format. Syntax. STR_TO_DATE (string, format) Parameter Values. Technical Details. More Examples. Example. Return a date based on a string and a format: SELECT STR_TO_DATE ("August,5,2017", "%M %e %Y"); Try it Yourself » Example.
To define a column that includes a fractional seconds part, use the syntax type_name (fsp), where type_name is TIME, DATETIME, or TIMESTAMP, and fsp is the fractional seconds precision. For example: CREATE TABLE t1 (t TIME(3), dt DATETIME(6), ts TIMESTAMP(0)); The fsp value, if given, must be in the range 0 to 6.
