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Rechercher dans le manuel MySQL
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https://dev.mysql.com/year.html
The YEAR type is a 1-byte type used to represent year values. It can be declared as YEAR or YEAR(4) and has a display width of four characters. Note MySQL 8.0 does not support the YEAR(2) data type permitted in older versions of MySQL. For ...As a ...
https://dev.mysql.com/two-digit-years.html
Date values with two-digit years are ambiguous because the century is unknown. Such values must be interpreted into four-digit form because MySQL stores years internally using four digits. For DATETIME, DATE, and TIMESTAMP types, MySQL interprets ...Remember that these rules are only heuristics that provide reasonable guesses as to what your data values ...
https://dev.mysql.com/group-by-modifiers.html
To also determine the total profit summed over all years, you must add up the individual values yourself or run an additional query. Following each set of rows for a given year, an extra super-aggregate summary row appears showing the total for all ... The GROUP BY clause permits a WITH ROLLUP modifier that causes summary output to include extra rows that represent higher-level (that is, super-aggregate) summary ...
https://dev.mysql.com/date-and-time-functions.html
These functions are affected: CONVERT_TZ(), DATE_ADD(), DATE_SUB(), DAYOFYEAR(), LAST_DAY() (permits a day part of zero), TIMESTAMPDIFF(), TO_DAYS(), TO_SECONDS(), WEEK(), WEEKDAY(), WEEKOFYEAR(), YEARWEEK(). The return value depends on the ... This ...
https://dev.mysql.com/partitioning-management-range-list.html
clauses, so that s0 contains only those records for which YEAR(dob) is less than 1960 and s1 contains those rows in which YEAR(dob) is greater than or equal to 1960 but less than 1970. For example, partitions p1 and p2 together cover the years 1980 ... Adding and dropping of range and list partitions are handled in a similar fashion, so we discuss the management of both sorts of partitioning in this ...
https://dev.mysql.com/date-and-time-literals.html
The TIMESTAMP syntax produces a DATETIME value in MySQL because DATETIME has a range that more closely corresponds to the standard SQL TIMESTAMP type, which has a year range from 0001 to 9999. (The MySQL TIMESTAMP year range is 1970 to 2038.) String ... Date and time values can be represented in several formats, such as quoted strings or as numbers, depending on the exact type of the value and other ...
https://dev.mysql.com/date-and-time-type-overview.html
MySQL displays YEAR values in YYYY format, but permits assignment of values to YEAR columns using either strings or numbers. For additional information about YEAR display format and interpretation of input values, see Section 11.3.3, “The YEAR ...
https://dev.mysql.com/date-and-time-types.html
The date and time types for representing temporal values are DATE, TIME, DATETIME, TIMESTAMP, and YEAR. Although MySQL tries to interpret values in several formats, date parts must always be given in year-month-day order (for example, '98-09-04'), ...Each temporal type has a range of valid values, as well as a “zero” value that may be used when you specify an invalid value that MySQL cannot ...
https://dev.mysql.com/func-op-summary-ref.html
WEEK() Return the week number WEEKDAY() Return the weekday index WEEKOFYEAR() Return the calendar week of the date (1-53) WEIGHT_STRING() Return the weight string for a string XOR Logical XOR YEAR() Return the year YEARWEEK() Return the year and ...
https://dev.mysql.com/partitioning-hash.html
For instance, you might want to partition based on the year in which an employee was hired. The variance of the expression YEAR(date_col) with respect to date_col is not quite as direct as that of TO_DAYS(date_col), because not every possible change ... Partitioning by HASH is used primarily to ensure an even distribution of data among a predetermined number of ...
Document created the 26/06/2006, last modified the 26/10/2018
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