Oracle 5.0 Reference Manual page 555

variable requires the
SUPER
that time on. Setting the
session [495]
sql_mode
You can retrieve the current global or session
SELECT @@GLOBAL.sql_mode;
SELECT @@SESSION.sql_mode;
The most important
sql_mode
• [540]
ANSI
This mode changes syntax and behavior to conform more closely to standard SQL.
•
STRICT_TRANS_TABLES
If a value could not be inserted as given into a transactional table, abort the statement. For a
nontransactional table, abort the statement if the value occurs in a single-row statement or the first
row of a multiple-row statement. More detail is given later in this section. (Implemented in MySQL
5.0.2)
• [540]
TRADITIONAL
Make MySQL behave like a "traditional" SQL database system. A simple description of this mode is
"give an error instead of a warning" when inserting an incorrect value into a column.
Note
The
what you want if you are using a nontransactional storage engine, because
data changes made prior to the error may not be rolled back, resulting in a
"partially done" update. (Added in MySQL 5.0.2)
When this manual refers to "strict mode," it means a mode where at least one of
STRICT_TRANS_TABLES
The following list describes all supported modes:
•
ALLOW_INVALID_DATES
Do not perform full checking of dates. Check only that the month is in the range from 1 to 12 and the
day is in the range from 1 to 31. This is very convenient for Web applications where you obtain year,
month, and day in three different fields and you want to store exactly what the user inserted (without
date validation). This mode applies to
columns, which always require a valid date.
This mode is implemented in MySQL 5.0.2. Before 5.0.2, this was the default MySQL date-
handling mode. As of 5.0.2, the server requires that month and day values be legal, and
not merely in the range 1 to 12 and 1 to 31, respectively. With strict mode disabled, invalid
dates such as
'2004-04-31'
With strict mode enabled, invalid dates generate an error. To permit such dates, enable
ALLOW_INVALID_DATES
• [535]
ANSI_QUOTES
Treat """ as an identifier quote character (like the "`" quote character) and not as a string
quote character. You can still use "`" to quote identifiers with this mode enabled. With
[535]
ANSI_QUOTES
because it is interpreted as an identifier.
Server SQL Modes
[578] privilege and affects the operation of all clients that connect from
variable affects only the current client. Any client can change its own
SESSION
value at any time.
sql_mode
[495] values are probably these:
[539]
aborts as soon as the error is noticed. This may not be
INSERT/UPDATE
[539] or
STRICT_ALL_TABLES
[535]
DATE
are converted to
[535].
enabled, you cannot use double quotation marks to quote literal strings,
535
[495] value with the following statements:
[539] is enabled.
and columns. It does not apply
DATETIME
and a warning is generated.
'0000-00-00'
TIMESTAMP