79476

79476



Data types. These data type changes have been implemented:

•    MySQL now permits fractional seconds for TIME, datetime, and TIMESTAMP values, with upto

microseconds (6 digits) precision. See Section 11.3.6, “Fractional Seconds in Time Values”.

•    Previously, at most one timestamp column per table could be automatically initialized or

updated to the current datę and time. This restriction has been lifted. Any TIMESTAMP column

definition can have any combination of default current timestamp and ON UPDATE

current_timestamp clauses. In addition, these clauses now can be used with datetime

column definitions. For morę information, see Section 11.3.5, “Automatic Initialization and

Updating for timestamp and DATETIME”.

•    In MySQL, the TIMESTAMP data type differs in nonstandard ways from other data types in

terms of default value and assignment of automatic initialization and update attributes. These

behaviors remain the default but now are deprecated, and can be turned off by enabling the

explicit_def aults_for_timestamp [495] system variable at server startup. See

Section 11.3.5, “Automatic Initialization and Updating for timestamp and DATETIME”, and

Section 5.1.4, “Server System Variables”.

•    The year (2) data type is now deprecated. year (2) columns in existing tables are treated as

before, but year(2) in newor altered tables are converted to year(4). For morę information,

see Section 11.3.4, “year(2) Limitations and Migrating to YEAR(4)”.



Wyszukiwarka

Podobne podstrony:
EF 5 Features Spatial Data Type (Geometry type support). Spatial data types support is backed up by
25 Anthropogenic changes in the suspended,.. tributaries, have been obtained using eąuations for the
Data Type The data type attribute defines the kind of data to be stored in the column. When you crea
Types of grammar practicex from accuracy teiKau£lKy 1)    awareness: stiidents have b
lation lives in villages, all these people have been left out of the def-ined system of self-managin
18916 shoes&pattens9 39 Shoes from London siłes, 1100-1450 ponent of the assemblages. These may hav
Creasey, John Hang the Little Man SB1 THRILLER BOOK CLUB Books by all these farnous Authors have
skanuj0001 Self-Assessment Moauie i A There are and always have been as many different types of musi
Creasey, John Hang the Little Man SB1 THRILLER BOOK CLUB •fę Books by all these famous Auth
detaiico O RegView Ab out File Edit View Jools ę3yZ£HĆ.B&gView e Seftrch Name Data 1 Type
2012 11 17 11 39 nulvarlabie Va
So Far in This Course... We’ve dealt with data that has already been classified and transformed to a

więcej podobnych podstron