Following is a list of SQL enhancements introduced in SQL Anywhere version 12.0.0.
Improved qualification for named index hints A PRIMARY KEY index and a FOREIGN KEY index on a table can have the same name. When this is true, a named index hint can not be unambiguously specified. The specification of a named index hint has been extended to allow the qualification of a hinted index as a PRIMARY KEY index or a FOREIGN KEY index. See INDEX clause, FROM clause.
New IS DISTINCT FROM and IS NOT DISTINCT FROM search conditions The IS DISTINCT FROM and IS NOT DISTINCT FROM search conditions allow you to control the evaluation of equality in the case of NULLs. See IS DISTINCT FROM and IS NOT DISTINCT FROM search conditions.
CREATE SYNCHRONIZATION PROFILE statement This statement creates a SQL Anywhere synchronization profile. A synchronization profile defines how a SQL Anywhere database synchronizes with the MobiLink server. See CREATE SYNCHRONIZATION PROFILE statement [MobiLink].
New WITH NULLS NOT DISTINCT clause, CREATE INDEX statement A new clause, WITH NULLS NOT DISTINCT, has been added to the CREATE INDEX statement for use when creating UNIQUE indexes. This clause allows you to specify that NULLs in index keys are not unique. You must upgrade or rebuild existing databases to use this feature. See the UNIQUE clause of the CREATE INDEX statement.
Back quote identifier delimiter Back quotes can now be used as an identifier delimiter. See Identifiers.
New SAVE OPTION VALUES clause for ALTER TEXT CONFIGURATION statement Use this new clause to change the values of the date_format, time_format, timestamp_format, and timestamp_with_time_zone_format options saved with a text configuration object. See ALTER TEXT CONFIGURATION statement.
ALTER SERVER and CREATE SERVER statements The new IQODBC and IQJDBC server classes allow you to specify a Sybase IQ server as a remote connection. See ALTER SERVER statement and CREATE SERVER statement.
New LOCK FEATURE statement This statement prevents other concurrent connections from using a database server feature. See LOCK FEATURE statement.
Enhancements to the LOAD TABLE statement The LOAD TABLE statement now supports the load-option clause, which allows you to control how data is loaded. It also supports the value XML in the FORMAT clause. See LOAD TABLE statement.
New LIMIT clause support for SELECT statements You can now specify row counts and offsets in a SELECT statement using the new LIMIT clause. See SELECT statement.
Enhancement to the SET OPTION statement Syntax 1 of the SET OPTION statement now supports setting an option using the contents of a variable. See SET OPTION statement.
INSERT statement enhancements The following enhancements have been made to the INSERT statement. See INSERT statement.
Support for more than one list of values An INSERT statement can now contain more than one list of values, allowing several rows to be inserted at once. For example:
INSERT INTO T (c1,c2,c3) VALUES (1,10,100), (2,20,200), (3,30,300);
Support for inserting rows with all default values SQL Anywhere allows the VALUES clause to contain specified values for a subset of the columns in the table. All unspecified columns are given default values as specified for each column by means of DEFAULT, NULL and COMPUTE clauses of the CREATE TABLE statements. Previously, the database server required that you specify input values for at least one of the columns in the table.
Now, however, all columns can be given their default values by using either of the following syntax extensions:
INSERT [ INTO ] table-name options DEFAULT VALUES ...
INSERT [ INTO ] table-name ( ) options VALUES ( ) [ , ( ) ... ]
Specifying DEFAULT VALUES or VALUES is semantically equivalent to using the following syntax, where the number of default entries is equal to the number of columns in the table:
INSERT [ INTO ] table-name VALUES( default, default, ..., default )
The DEFAULT VALUES clause is part of the SQL/2008 standard, whereas the VALUES clause is a vendor extension.
New START SERVER statement The START SERVER statement has been added. It should be used instead of the START ENGINE statement, which is now deprecated. See START SERVER statement [Interactive SQL].
New STOP SERVER statement The STOP SERVER statement has been added. It should be used instead of the STOP ENGINE statement, which is now deprecated. See STOP SERVER statement.
New CHECKSUM clause for the ALTER DATABASE statement The CHECKSUM OFF clause lets you disable global checksums for databases. Global checksums are enabled by default for new version 12 databases. See ALTER DATABASE statement.
DELETE statement enhancement The DELETE statement now supports correlation names. See DELETE statement.
Discuter à propos de cette page dans DocCommentXchange.
|Copyright © 2012, iAnywhere Solutions, Inc. - SQL Anywhere 12.0.1|