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Файл:Semestr2 / 1 - Oracle / Oracle selected docs / SQL reference.pdf
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- •Contents
- •Send Us Your Comments
- •Preface
- •What’s New in SQL Reference?
- •1 Introduction to Oracle SQL
- •History of SQL
- •SQL Standards
- •Embedded SQL
- •Lexical Conventions
- •Tools Support
- •2 Basic Elements of Oracle SQL
- •Datatypes
- •Oracle Built-in Datatypes
- •ANSI, DB2, and SQL/DS Datatypes
- •Oracle-Supplied Types
- •"Any" Types
- •XML Types
- •Spatial Type
- •Media Types
- •Datatype Comparison Rules
- •Data Conversion
- •Literals
- •Text Literals
- •Integer Literals
- •Number Literals
- •Interval Literals
- •Format Models
- •Number Format Models
- •Date Format Models
- •String-to-Date Conversion Rules
- •XML Format Model
- •Nulls
- •Nulls in SQL Functions
- •Nulls with Comparison Conditions
- •Nulls in Conditions
- •Pseudocolumns
- •CURRVAL and NEXTVAL
- •LEVEL
- •ROWID
- •ROWNUM
- •XMLDATA
- •Comments
- •Comments Within SQL Statements
- •Comments on Schema Objects
- •Hints
- •Database Objects
- •Schema Objects
- •Nonschema Objects
- •Parts of Schema Objects
- •Schema Object Names and Qualifiers
- •Schema Object Naming Rules
- •Schema Object Naming Examples
- •Schema Object Naming Guidelines
- •Syntax for Schema Objects and Parts in SQL Statements
- •How Oracle Resolves Schema Object References
- •Referring to Objects in Other Schemas
- •Referring to Objects in Remote Databases
- •Referencing Object Type Attributes and Methods
- •3 Operators
- •About SQL Operators
- •Unary and Binary Operators
- •Operator Precedence
- •Arithmetic Operators
- •Concatenation Operator
- •Set Operators
- •4 Expressions
- •About SQL Expressions
- •Simple Expressions
- •Compound Expressions
- •CASE Expressions
- •CURSOR Expressions
- •Datetime Expressions
- •Function Expressions
- •INTERVAL Expressions
- •Object Access Expressions
- •Scalar Subquery Expressions
- •Type Constructor Expressions
- •Variable Expressions
- •Expression Lists
- •5 Conditions
- •About SQL Conditions
- •Condition Precedence
- •Comparison Conditions
- •Simple Comparison Conditions
- •Group Comparison Conditions
- •Logical Conditions
- •Membership Conditions
- •Range Conditions
- •Null Conditions
- •EQUALS_PATH
- •EXISTS Conditions
- •LIKE Conditions
- •IS OF type Conditions
- •UNDER_PATH
- •Compound Conditions
- •6 Functions
- •SQL Functions
- •Single-Row Functions
- •Aggregate Functions
- •Analytic Functions
- •Object Reference Functions
- •Alphabetical Listing of SQL Functions
- •ACOS
- •ADD_MONTHS
- •ASCII
- •ASCIISTR
- •ASIN
- •ATAN
- •ATAN2
- •BFILENAME
- •BITAND
- •CAST
- •CEIL
- •CHARTOROWID
- •COALESCE
- •COMPOSE
- •CONCAT
- •CONVERT
- •CORR
- •COSH
- •COUNT
- •COVAR_POP
- •COVAR_SAMP
- •CUME_DIST
- •CURRENT_DATE
- •CURRENT_TIMESTAMP
- •DBTIMEZONE
- •DECODE
- •DECOMPOSE
- •DENSE_RANK
- •DEPTH
- •DEREF
- •DUMP
- •EMPTY_BLOB, EMPTY_CLOB
- •EXISTSNODE
- •EXTRACT (datetime)
- •EXTRACT (XML)
- •EXTRACTVALUE
- •FIRST
- •FIRST_VALUE
- •FLOOR
- •FROM_TZ
- •GREATEST
- •GROUP_ID
- •GROUPING
- •GROUPING_ID
- •HEXTORAW
- •INITCAP
- •INSTR
- •LAST
- •LAST_DAY
- •LAST_VALUE
- •LEAD
- •LEAST
- •LENGTH
- •LOCALTIMESTAMP
- •LOWER
- •LPAD
- •LTRIM
- •MAKE_REF
- •MONTHS_BETWEEN
- •NCHR
- •NEW_TIME
- •NEXT_DAY
- •NLS_CHARSET_DECL_LEN
- •NLS_CHARSET_ID
- •NLS_CHARSET_NAME
- •NLS_INITCAP
- •NLS_LOWER
- •NLSSORT
- •NLS_UPPER
- •NTILE
- •NULLIF
- •NUMTODSINTERVAL
- •NUMTOYMINTERVAL
- •PATH
- •PERCENT_RANK
- •PERCENTILE_CONT
- •PERCENTILE_DISC
- •POWER
- •RANK
- •RATIO_TO_REPORT
- •RAWTOHEX
- •RAWTONHEX
- •REFTOHEX
- •REGR_ (Linear Regression) Functions
- •REPLACE
- •ROUND (number)
- •ROUND (date)
- •ROW_NUMBER
- •ROWIDTOCHAR
- •ROWIDTONCHAR
- •RPAD
- •RTRIM
- •SESSIONTIMEZONE
- •SIGN
- •SINH
- •SOUNDEX
- •SQRT
- •STDDEV
- •STDDEV_POP
- •STDDEV_SAMP
- •SUBSTR
- •SYS_CONNECT_BY_PATH
- •SYS_CONTEXT
- •SYS_DBURIGEN
- •SYS_EXTRACT_UTC
- •SYS_GUID
- •SYS_TYPEID
- •SYS_XMLAGG
- •SYS_XMLGEN
- •SYSDATE
- •SYSTIMESTAMP
- •TANH
- •TO_CHAR (character)
- •TO_CHAR (datetime)
- •TO_CHAR (number)
- •TO_CLOB
- •TO_DATE
- •TO_DSINTERVAL
- •TO_MULTI_BYTE
- •TO_NCHAR (character)
- •TO_NCHAR (datetime)
- •TO_NCHAR (number)
- •TO_NCLOB
- •TO_NUMBER
- •TO_SINGLE_BYTE
- •TO_TIMESTAMP
- •TO_TIMESTAMP_TZ
- •TO_YMINTERVAL
- •TRANSLATE
- •TRANSLATE ... USING
- •TREAT
- •TRIM
- •TRUNC (number)
- •TRUNC (date)
- •TZ_OFFSET
- •UNISTR
- •UPDATEXML
- •UPPER
- •USER
- •USERENV
- •VALUE
- •VAR_SAMP
- •VARIANCE
- •VSIZE
- •WIDTH_BUCKET
- •XMLAGG
- •XMLCOLATTVAL
- •XMLCONCAT
- •XMLELEMENT
- •XMLFOREST
- •XMLSEQUENCE
- •XMLTRANSFORM
- •ROUND and TRUNC Date Functions
- •User-Defined Functions
- •Prerequisites
- •Name Precedence
- •7 Common SQL DDL Clauses
- •allocate_extent_clause
- •constraints
- •deallocate_unused_clause
- •file_specification
- •logging_clause
- •parallel_clause
- •physical_attributes_clause
- •storage_clause
- •8 SQL Queries and Subqueries
- •About Queries and Subqueries
- •Creating Simple Queries
- •Hierarchical Queries
- •The UNION [ALL], INTERSECT, MINUS Operators
- •Sorting Query Results
- •Joins
- •Using Subqueries
- •Unnesting of Nested Subqueries
- •Selecting from the DUAL Table
- •Distributed Queries
- •9 SQL Statements: ALTER CLUSTER to ALTER SEQUENCE
- •Types of SQL Statements
- •Organization of SQL Statements
- •ALTER CLUSTER
- •ALTER DATABASE
- •ALTER DIMENSION
- •ALTER FUNCTION
- •ALTER INDEX
- •ALTER INDEXTYPE
- •ALTER JAVA
- •ALTER MATERIALIZED VIEW
- •ALTER MATERIALIZED VIEW LOG
- •ALTER OPERATOR
- •ALTER OUTLINE
- •ALTER PACKAGE
- •ALTER PROCEDURE
- •ALTER PROFILE
- •ALTER RESOURCE COST
- •ALTER ROLE
- •ALTER ROLLBACK SEGMENT
- •ALTER SEQUENCE
- •10 SQL Statements: ALTER SESSION to ALTER SYSTEM
- •ALTER SESSION
- •ALTER SYSTEM
- •ALTER TABLE
- •ALTER TABLESPACE
- •ALTER TRIGGER
- •ALTER TYPE
- •ALTER USER
- •ALTER VIEW
- •ANALYZE
- •ASSOCIATE STATISTICS
- •AUDIT
- •CALL
- •COMMENT
- •COMMIT
- •13 SQL Statements: CREATE CLUSTER to CREATE JAVA
- •CREATE CLUSTER
- •CREATE CONTEXT
- •CREATE CONTROLFILE
- •CREATE DATABASE
- •CREATE DATABASE LINK
- •CREATE DIMENSION
- •CREATE DIRECTORY
- •CREATE FUNCTION
- •CREATE INDEX
- •CREATE INDEXTYPE
- •CREATE JAVA
- •14 SQL Statements: CREATE LIBRARY to CREATE SPFILE
- •CREATE LIBRARY
- •CREATE MATERIALIZED VIEW
- •CREATE MATERIALIZED VIEW LOG
- •CREATE OPERATOR
- •CREATE OUTLINE
- •CREATE PACKAGE
- •CREATE PACKAGE BODY
- •CREATE PFILE
- •CREATE PROCEDURE
- •CREATE PROFILE
- •CREATE ROLE
- •CREATE ROLLBACK SEGMENT
- •CREATE SCHEMA
- •CREATE SEQUENCE
- •CREATE SPFILE
- •15 SQL Statements: CREATE SYNONYM to CREATE TRIGGER
- •CREATE SYNONYM
- •CREATE TABLE
- •CREATE TABLESPACE
- •CREATE TEMPORARY TABLESPACE
- •CREATE TRIGGER
- •CREATE TYPE
- •CREATE TYPE BODY
- •CREATE USER
- •CREATE VIEW
- •DELETE
- •DISASSOCIATE STATISTICS
- •DROP CLUSTER
- •DROP CONTEXT
- •DROP DATABASE LINK
- •DROP DIMENSION
- •DROP DIRECTORY
- •DROP FUNCTION
- •DROP INDEX
- •DROP INDEXTYPE
- •DROP JAVA
- •DROP LIBRARY
- •DROP MATERIALIZED VIEW
- •DROP MATERIALIZED VIEW LOG
- •DROP OPERATOR
- •DROP OUTLINE
- •DROP PACKAGE
- •DROP PROCEDURE
- •DROP PROFILE
- •DROP ROLE
- •DROP ROLLBACK SEGMENT
- •17 SQL Statements: DROP SEQUENCE to ROLLBACK
- •DROP SEQUENCE
- •DROP SYNONYM
- •DROP TABLE
- •DROP TABLESPACE
- •DROP TRIGGER
- •DROP TYPE
- •DROP TYPE BODY
- •DROP USER
- •DROP VIEW
- •EXPLAIN PLAN
- •GRANT
- •INSERT
- •LOCK TABLE
- •MERGE
- •NOAUDIT
- •RENAME
- •REVOKE
- •ROLLBACK
- •18 SQL Statements: SAVEPOINT to UPDATE
- •SAVEPOINT
- •SELECT
- •SET CONSTRAINT[S]
- •SET ROLE
- •SET TRANSACTION
- •TRUNCATE
- •UPDATE
- •Required Keywords and Parameters
- •Optional Keywords and Parameters
- •Syntax Loops
- •Multipart Diagrams
- •Database Objects
- •ANSI Standards
- •ISO Standards
- •Oracle Compliance
- •FIPS Compliance
- •Oracle Extensions to Standard SQL
- •Character Set Support
- •Using Extensible Indexing
- •Using XML in SQL Statements
- •Index
6
Functions
Functions are similar to operators in that they manipulate data items and return a result. Functions differ from operators in the format of their arguments. This format enables them to operate on zero, one, two, or more arguments:
function(argument, argument, ...)
This chapter contains these sections:
■
■
SQL Functions
User-Defined Functions
Functions 6-1
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