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If collation for a column is not specified explicitly in the DDL statement that creates the column , then the containing table’s default collation is used for the column. If the DDL statement creating a table does not specify a default collation, then the default collation of the schema owning the table is used as the default collation for the table. Specify default collation for a schema in the CREATE USER statement that creates the owner of the schema. If the CREATE USER statement does not specify the default collation for a schema, then the collation USING_NLS_COMP is used. This collation does not directly specify the collating rules for a character data type.
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- In this case one of these currently used connections can be selected to complete the connection details.
- Only the USING_NLS_COMP collation is supported for columns referenced using the %TYPE and %ROWTYPE attributes in PL/SQL units.
- This expression looks for 6-character strings with lowercase characters.
- However, if the remote Oracle Database 12.2 node receives a DML statement, the statement is evaluated, even if it references columns with a declared collation other than USING_NLS_COMP.
- This means that several scans can be set for a sample and measured automatically without the presence of the user.
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The COLLATE clause of a standard or a virtual column definition in a CREATE TABLE or ALTER TABLE statement. The only collation supported by CLOB and NCLOB columns is the pseudo-collation USING_NLS_COMP. If the pseudo-collation is USING_NLS_SORT_AI and the value of NLS_SORT does not end in _CI or _AI, then the name of collation to apply is constructed github icos by appending _AI to the value of NLS_SORT. If the value of NLS_SORT ends in _CI, then the suffix _CI is changed to _AI. (12.1) and earlier releases, that is, they use the session collation. The particular named collation applied by the SQL or PL/SQL operation is either BINARY or determined by the value of NLS_SORT, NLS_COMP, and the operation itself.
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Introduction As of Oracle 9i, Oracle started to support the ANSI JOIN syntax which is part of the ANSI SQL standard. Basically, it’s an alternative mechanism for specifying joins from one set to another, but it has many advantages, readability being one of the most important. Another major advantage is that, for most cases, you can’t NOT specify a predicate (which, as we all know, is all too easy to do with the “old” syntax). In this case one of these currently used connections can be selected to complete the connection details. A Linear Reference System is used to store locations relative to their positions along a linear feature that has measures. Distance measures are then used to identify the location of these points or lines along the linear feature, rather than using X,Y values.
For dilute mixtures, this type of scan is used to identify species with a strong overlap between absorption and emission. Synchronous scans, together with the integrating sphere attachment, can also be used to measure the transmission/reflectance/absorption spectra of strongly scattering powders. Fluorescence excitation spectra are more selective than absorption spectra, as they reveal, by virtue of the selected emission wavelength, where the molecule can absorb photons to prodcue a particular emitting species. Accurate excitation spectra require a sensitive instrument, as the concentration of the sample must be kept low to avoid inner filter effects, and require reliable spectral correction to ensure proper spectral representation.
The collation of a bitmap join index key column or a column referenced in the bitmap index join condition can be changed with the ALTER TABLE MODIFY statement only among collations permitted in the index definition. This parameter determines the behavior of the function for UCA collations. The flag parameter values ‘S’ and ‘s’ mean that the UCA collation names are returned in the short format, that is, the format in which all the UCA collation parameters with default values are omitted. The flag parameter values ‘L’ and ‘l’ mean that the UCA collation names are returned in the long, canonical format, that is, the format in which all the UCA collation parameters are included, even if they have default values. For example, UCA0700_DUCET and UCA0700_DUCET_S4_VS_BN_NY_EN_FN_HN_DN_MN are short and long names of the same collation respectively. If the column collation is not specified explicitly with the COLLATE clause for a column, then the default collation of the table is used for that column, except for the cases documented below.
In addition, multilingual collation can handle canonical equivalence and supplementary characters. A linguistic collation operates by replacing characters with numeric values that reflect each character’s proper linguistic order. It produces reasonable results for the English alphabet because the ASCII and EBCDIC standards define the letters A to Z in ascending numeric value. PHP Calls a PHP function when Scripting used with a Macro load PHP With this command PHP functions can be called from within a Macro load. Because the PHP() command can be used in any cell this allows PHP functions to be called at any time, providing significant flexibility for how PHP can add further functionality to DataLoad loads. The name of the PHP function to be executed is included as a parameter, i.e. between the brackets.
This feature applies linguistic processing only where needed and achieves consistent handling of particular column data in all SQL statements. By assigning such collation to a column, you can easily force all comparisons of column values to be case-insensitive or accent-insensitive or both. The exact length of the prefix may be higher or lower and depends on the particular collation and the particular characters contained in the source string.
If a UCA collation is applied, collation keys contain concatenated primary, secondary, tertiary, and possibly quaternary values. The case-insensitive and accent-insensitive multilingual and UCA collations may omit quaternary, tertiary, and secondary values. The gateway uses user IDs and passwords to access the information in the remote database.
A collation-sensitive operation can be an SQL operator, condition, built-in function call, CASE expression or a query clause. Varray and nested table types do not have explicitly declared default collations, as they do not have PL/SQL methods or multiple attributes to apply the default collation. Package and type bodies do not have their own collations, and they use the default collations of their specifications. If a column belongs to a foreign key, its explicit collation specification must specify the same collation that is declared for the corresponding column of the referenced primary key or unique constraint.
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The collation for the column category is inherited from the effective schema default collation at the time of CREATE CLUSTER execution. Release 2 (12.2), a new mechanism has been added to apply collations for SQL operations in a much more granular way. A collation can be declared for a character data container, such as table column, and is passed to all SQL operations that operate on that column. Each collation-sensitive operation combines declared collations of its arguments to determine the collation to use for the operation processing.
Most SQL operations compare character values using binary collation, regardless of the value set in NLS_SORT. Binary collation can also be case-insensitive or accent-insensitive. When you specify BINARY_CI as a value for NLS_SORT, it designates a collation that is accent-sensitive and case-insensitive. BINARY_AI designates an accent-insensitive and case-insensitive binary collation.
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HS_FDS_RECOVERY_ACCOUNT to the user name of the Teradata user account you set up for recovery. Any Oracle client connected to the Oracle database can access Teradata data through the gateway. The Oracle client and the Oracle database can reside on different machines. The sqlnet.ora file is typically stored in $ORACLE_HOME/network/admin.
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- The collation of a foreign key column must be the same as the collation of the referenced column.
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- The SQL functions MAX() and MIN() cannot use linguistic indexes when NLS_COMP is set to LINGUISTIC.
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The local database node makes sure that the new SQL operators, such as COLLATE and NLS_COLLATION_NAME, are not sent to the remote database node. If an SQL statement has to be executed on the remote node , and if it contains the new SQL operators or a reference to a local column with collation other than USING_NLS_COMP, then an error is reported. The data-bound collation feature is not supported for table clustering and zone maps. Clustering and zone maps can only be applied to table columns declared with BINARY or USING_NLS_COMP collation. For all these collations, column values are clustered based on the BINARY collation.
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The value of NLS_COMP decides which operations are controlled by the collation specified in the value of NLS_SORT and which operations use the BINARY collation. All collation-sensitive operations selected by the value of NLS_COMP in all SQL and PL/SQL statements executed in the session use the same collation. The language column contains NLS_LANGUAGE values for the data in the column on which the index is built. The following example builds a single linguistic index for multiple languages. With this index, the rows with the same values for NLS_LANGUAGE are sorted together. Oracle Database chooses the index based on the NLS_SORT session parameter or the arguments of the NLSSORT function specified in the ORDER BY clause.
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Similarly, the %ROWTYPE attribute is not allowed on tables, views, cursors, or cursor variables with at least one character column with a declared collation other than USING_NLS_COMP. The columns with collations other than USING_NLS_COMP can be selected into INTO clause variables declared without those attributes. Thus, whatever is the collation of the selected columns, it is always overridden with the pseudo-collation USING_NLS_COMP for PL/SQL processing. Index clusters have an index, and the key value ordering for character key columns in this index is sensitive to collation. Hash clusters are not collation-sensitive in general because table rows are grouped based on a numerical hash function. However, the value of a user-defined hash function may depend on the collations of key columns referenced by the function.
