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CHAR → NCHAR
CHAR → The CHAR datatype is a string of characters, with a maximum length of 2000. CHAR strings are … converted to internal numeric format. If the CHAR string contains an illegal conversion character, Oracle
char → A text expression that specifies the character to use as an escape character in a LIKE text comparison. The default is no escape character. The LIKE escape character affects the LISTNAMES program, which accepts a LIKE argument that it uses in a LIKE text comparison. Notes Using the Escape Character The LIKE escape character lets you find text expressions that contain the LIKE operator wildcard characters,
CHAR Datatype → The CHAR datatype stores fixed-length character strings. When you create a table with a CHAR column … , you must specify a string length (in bytes or characters) between 1 and 2000 bytes for the CHAR … the table, the value for the CHAR column has the fixed length. If you give a shorter value, then the … compares
operator char() → This method returns the value of the Number object converted to a native char. Syntax operator char() const;
operator unsigned char() → This method returns the value of the Number object converted to a native unsigned char. Syntax operator unsigned char() const;
Using VARCHAR2 versus CHAR → VARCHAR2 versus CHAR The VARCHAR2 and CHAR datatypes differ in subtle but significant ways. CHAR … both values being compared in a SQL statement belong to type CHAR, blank-padding semantics are used … the length of the longer value. For example, if ENAME is a CHAR database column and emp_name is a
operator signed char() → This method returns the value of the Number object converted to a native signed char. Syntax operator signed char() const;
10.4.1 SQL CHAR Datatypes → The SQL CHAR datatypes include CHAR, VARCHAR2, and CLOB. These datatypes allow you to store
Inserting Character Values → a character value into a CHAR database column, Oracle does not strip trailing blanks. If the value
Comparing Character Values → being compared have equal lengths. If both values in a comparison have datatype CHAR, blank-padding … shorter value to the length of the longer value. For example, given the declarations last_name1 CHAR(5 … ):= 'BELLO'; last_name2 CHAR(10):= 'BELLO '; -- note trailing blanks the following IF condition is … false: IF last_name1
Selecting Character Values → a column value into a CHAR variable, if the value is shorter than the declared length of the … example, when you select a blank-padded CHAR column value into a VARCHAR2 variable, the trailing blanks
Assigning Character Values → When you assign a character value to a CHAR variable, if the value is shorter than the declared … includes six trailing blanks, not just one: last_name CHAR(10):= 'CHEN '; -- note trailing blank If the … character value is longer than the declared length of the CHAR variable, PL/SQL aborts the … trim trailing blanks. For example,
B Understanding CHAR and VARCHAR2 Semantics in PL/SQL → This appendix explains the semantic differences between the CHAR and VARCHAR2 base types. These
char 'fmt' Match or Error? → Table 2-18 Matching Character Data and Format Models with the FX Format Model Modifier char 'fmt
4.4.2 Streaming CHAR, VARCHAR, or RAW Columns → If you use the defineColumnType() Oracle extension to redefine a CHAR, VARCHAR, or RAW column as a … , because these columns are usually short. If you try to get a CHAR, VARCHAR, or RAW column as a data
Abstract Datatype CHAR NCHAR BLOB CLOB NCLOB → Table 2-7 Abstract Datatype Support for SQL Datatypes Abstract Datatype CHAR NCHAR BLOB CLOB NCLOB
Migrating CHAR Columns to NCHAR Columns → : Using the ALTER TABLE MODIFY Statement to Change CHAR Columns to NCHAR Columns Using Online Table … CHAR Columns to NCHAR Columns The ALTER TABLE MODIFY statement can be used to change table column … definitions from the CHAR datatypes to NCHAR datatypes. It also converts all of the data in the column
read_char (id IN PLS_INTEGER) RETURN CHAR → Reads a character value from the bytes message and returns the character value read. Null is returned if the end of the stream has been reached. Raises exception ORA-24196 if the bytes message is in write-only mode, ORA-24197 if the Java stored procedure throws an exception during execution, or ORA-24198 if the operation ID is invalid.
write_char (id IN PLS_INTEGER, value IN CHAR) → Writes a character value to the bytes message. If this value has multiple characters, it is the first character that is written. Raises exception ORA-24196 if the bytes message is in write-only mode, ORA-24197 if the Java stored procedure throws an exception during execution, or ORA-24198 if the operation ID is invalid.