Linguistic Sorting and Matching

A session default collation specified by the DEFAULT_COLLATION parameter does not get propagated to any remote sessions connected to the current session using DB links. This expression looks for 6-character strings with lowercase characters. The check_string constraint in the above example performs a pessimistic check over all the collations. If you know that one or two specific collations will be used with a column, you can modify the check constraint to force generation of collation keys only for those collations. However, in that case, you have to restrict the collations that can be used in your application. The UCA0700 collations other than UCA0700_DUCET and UCA0700_ROOT have been customized to never generate collation keys longer than the chosen expansion ratio.

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Database Integration

Furthermore, an operation that returns a character value combines collations of its arguments to derive a collation for the result. The operator COLLATE allows overriding a collation in any place in an expression. The column-level collation feature is based on the ISO SQL standard and it simplifies application migration to Oracle Database from other database systems that support this feature. This feature is backward-compatible with the mechanism of controlling linguistic behavior for SQL and PL/SQL operations using the session parameters NLS_COMP and NLS_SORT. If a monolingual collation is applied, collation keys contain concatenated major values for characters of the source value followed by concatenated minor values for those characters. If a multilingual collation is applied, collation keys contain concatenated primary, then secondary, and then tertiary values.

  • At the time of its creation is USING_NLS_COMP, or its definition contains an explicit DEFAULT COLLATION USING_NLS_COMP clause.
  • The sqlnet.ora file is typically stored in $ORACLE_HOME/network/admin.
  • Domain indexes can be created only on table columns declared with collation BINARY, USING_NLS_COMP, USING_NLS_SORT, or USING_NLS_SORT_CS.

An SQL operation in an Oracle Database is generally sensitive to the case and the accents of characters. However, sometimes you may need to perform case-insensitive or accent-insensitive comparison or matching. Is an attribute of a multilingual collation and describes how equivalent code point sequences are sorted. If canonical equivalence is applied in a particular multilingual collation, then canonically equivalent strings are treated as equal.

9 SQL Regular Expressions in a Multilingual Environment

Are user-defined characters or predefined characters in Unicode that require two code points within a specific code range. You can define up to 1.1 million code points in one multilingual sort. The mouse commands are suitable where the item to be clicked will always be in the same location. Maximising the application’s main or parent window, i.e. the one containing all forms, helps to ensure the screen coordinates remain correct.

Cluster keys usually have very few columns and new columns cannot be added to a cluster using the ALTER CLUSTER command. The default collation for a column in a cluster is always derived from the effective schema default collation. Collation_name is the name the collation to be assigned to the value of the expression expr.

There are no secondary ignorable characters defined in the UCA DUCET, however. Primary ignorable characters are ignored when the multilingual collation or UCA collation definition applied to the given comparison has the accent-insensitivity modifier _AI, for example, GENERIC_M_AI or UCA0700_DUCET_AI. For Asian language data or multilingual data, Oracle Database provides a sorting mechanism based on the ISO standard. For example, Chinese characters can be ordered by the number of strokes, PinYin, or radicals.

  • This function returns NULL value, if the collation of the expression is undefined due to any collation conflict in the expression tree.
  • For example, SPACE (U+0020) is not ignored in comparison at primary level.
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  • Only new tables created in the schema after the change inherit the new default collation.
  • This feature is backward-compatible with the mechanism of controlling linguistic behavior for SQL and PL/SQL operations using the session parameters NLS_COMP and NLS_SORT.
  • If the DEFAULT_COLLATION parameter is specified for a session, then it overrides the default collation of a schema referenced in that session.

Refer to Initialization Parametersfor the complete list of initialization parameters that can be set. Changes made to the initialization parameters only take effect in the next gateway session. The most important parameter is the HS_FDS_CONNECT_INFO, which describes the connection to the non-Oracle system. User-defined types support only the pseudo-collation USING_NLS_COMP.

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You cannot use the Oracle Net Assistant or the Oracle Net Easy Config tools to configure the tnsnames.ora file. Initialization Parameters and the Oracle Database Heterogeneous Connectivity Administrator’s Guide for more information about customizing the initialization parameter file. The DML row-level triggers cannot reference fields of OLD, NEW, or PARENT pseudo-records, or correlation names that correspond to columns with declared collation other than USING_NLS_COMP. The collation of a foreign key column cannot be changed with the ALTER TABLE MODIFY statement.

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An index-organized table stores columns of its primary key plus zero or more columns in its primary key index, and the rest of the columns in a heap-organized overflow segment. The collation of a foreign key column must be the same as the collation of the referenced column. This requirement is checked when the foreign key constraint is defined. Release 2 (12.2), the function COLLATION returns the derived data-bound collation of a character expression. If they are not equal and the PL/SQL unit does not contain the DEFAULT COLLATION clause, then an error is reported and the statement fails without compiling the object. The compilation fails, if the object does not satisfy the requirements described in the section “Effect of Data-Bound Collation on PL/SQL Types and User-Defined Types”.

The default collation of the view, which is BINARY collation, is used only to derive the collation of the character literal ‘j%’. However, collation of a literal has lower priority than collation of a column. The collation of the column last_name, which is BINARY_CI, takes precedence and is used by the operator LIKE. You can specify a default data-bound collation for a view and a materialized view by using the DEFAULT COLLATION clause in the CREATE VIEW and CREATE MATERIALIZED VIEW statements respectively. Is a combination of the corresponding schema default collation and the value of the DEFAULT_COLLATION parameter for the session.

Usage ranges from a simple search for a string such as San Francisco to the more complex task of extracting all URLs to finding all words whose every second character is a vowel. You should set NLS_SORT as a client environment variable so that you can use the same SQL statements for all languages. Different linguistic indexes can be used when NLS_SORT is set in the client environment. The NLS_SORT parameter should indicate the linguistic definition you want to use for the linguistic collation. If you want a French linguistic collation order, then NLS_SORT should be set to FRENCH.

Secondary ignorable characters are ignored when the applied definition has either the accent-insensitivity modifier _AI or the case-insensitivity modifier _CI. The parameter hiraganaQuaternary is applicable to the UCA collations for the Japanese language only. If it is set to “on” , then the corresponding Hiragana and Katakana characters have different quaternary weights. The quaternary level is used to distinguish variable characters from other characters, if variable characters are weighted as shifted. It is also used to distinguish Hiragana from Katakana with the same base and case. For sorting multilingual data, Oracle recommends the latest supported version of UCA collations.

Combinations of excitation, emission, synchronous scans, excitation-emission or synchronous maps can be run in Batch Measurements. This means that several scans can be set for a sample and measured automatically without the presence of the user. The scans can be set to repeat in loops as many times as required, with a fixed pre-set delay between each scan.

You create several initialization parameter files, each with different SIDs and different parameter settings. The log table, called HS_TRANSACTION_LOG, is where two-phase commit transactions are recorded. Alternatively users can specify a different table name by setting a gateway initialization parameter HS_FDS_TRANSACTION_LOG parameter.

The column collation, if not specified explicitly, is inherited from the table default collation, which in turn is inherited from the schema default collation. This way, you can easily declare all the character columns in a database as case-insensitive by default, and use explicit collation declarations only for columns that require a case-sensitive collation. If a schema default collation is not specified explicitly in the CREATE USER statement, then it is set to USING_NLS_COMP collation. You can change the schema default collation with the ALTER USER statement. The change does not affect the existing database objects and affects only the database objects that are subsequently created, replaced, or compiled in the schema. Release 2 (12.2), each table column with a character data type has a declared data-bound collation.

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  • When both case and diacritics are ignored , ä is sorted with the other characters whose base letter is a.
  • Distributed queries and DML operations may involve one or more database nodes of different Oracle Database releases, such as, 12.2, 12.1, and earlier.
  • In multilingual collation and UCA collation, certain characters may be treated as ignorable.
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  • If the resulting default object collation is different from USING_NLS_COMP, the database object is created as invalid with a compilation error.

There is no implicit conversion of the argument of COLLATE to a character data type. The COLLATE operator has the same precedence as other unary operators, but it is a postfix operator and it is evaluated only after all the prefix operators are evaluated. If the defining expression of a column has no derived collation, an error is reported. According to the POSIX standard, a range in a regular expression includes all collation elements between the start point and the end point of the range in the linguistic definition of the current locale. The semantics of the range expression must be independent of the character set. For example, searching for all strings greater than c and less than f produces different results depending on the value of NLS_SORT.

Use the NLSSORT function with the NLS_SORT parameter set to german to obtain a German collation. Append _CI to an Oracle Database collation name for a case-insensitive collation. A composed character like á can be decomposed into a and ‘, each with their own encoding.

Only one gateway instance can participate in an Oracle two-phase commit transaction as the commit point site. The data-bound collation feature is not supported for Oracle Text indexes and other domain indexes. Domain indexes can be created only on table columns declared with collation BINARY, USING_NLS_COMP, USING_NLS_SORT, or USING_NLS_SORT_CS. The collations of cluster key columns must match the collations of the corresponding columns in the tables created in the cluster. If a column has the data type of CLOB or NCLOB, then its specified collation must be USING_NLS_COMP.

If a column belongs to a foreign key and has no explicit collation specification, its collation is assigned from the corresponding column of the referenced primary key or unique constraint. If a column belongs to two or more foreign key constraints referencing primary key or unique constraints with different collation specifications, an error is reported. There are no operators allowed on LONG data type values in SQL, other than conversion to CLOB data type.