Select to_char(sysdate,’DAY’)”Today” FROM DUAL For example to see the current day you can To translate the date into a different format string you can use To see the current system date and time with fractional seconds with time SELECT SESSIONTIMEZONE, CURRENT_DATE FROM DUAL To see the current system date and time with time zone use CURRENT_DATEĪLTER SESSION SET NLS_DATE_FORMAT = 'DD-MON-YYYY HH24:MI:SS' The default setting of NLS_DATE_FORMAT is DD-MON-YY Then give the give the following statement The format in which the date is displayed depends on NLS_DATE_FORMATįor example set the NLS_DATE_FORMAT to the following formatĪlter session set NLS_DATE_FORMAT=’DD-MON-YYYY HH:MIpm’
To see the current system date and time give the following query. SYSDATE :Returns the current date and time.įunction returns the system date, including fractional seconds and time zone Zone, in a value in the Gregorian calendar of datatype To see the system date and time use the following functions :ĬURRENT_DATE :returns the current date in the session time Integrity Constraints (PRIMARY KEY, NOT NULL.) DEFAULT Values Dropping Constraints Disabling and Enabling Differing Constraints Check View Info about Constraints Working with Dates Oracle Views Oracle Sequences Oracle Synonyms Indexes and Clusters Table Partitioning Altering Partition Tables Dropping Partitions Merging Partitions Splitting Partitions Coalescing Partitions Oracle Objects and Object Types
Oracle TO_TIMESTAMP Number Functions (Math Functions) Character Functions Miscellaneous Functions Aggregate Functions Date and Time Functions Oracle Join Queries GROUP BY Queries, SUB Queries CUBE, ROLLUP Functions Oracle DML (INSERT, UPDATE, DELETE.) Oracle DDL (CREATE, ALTER, DROP.) COMMIT, ROLLBACK,SAVEPOINT Data Control Language (GRANT, REVOKE) Oracle SQL Tutorial Contents Introduction to Databases CODD'S Rules Datatypes and Create Table Oracle SELECT Statement Formatting in SQL*Plus UNION, INTERSECT, MINUS Operators and Sorting Query Result 60 Technical Questions 42 Backup & Recovery Questions Unix For Oracle DBA 20 Questions
The by far easier way is to use A元2UTF8 as Database characterset and forget about that there even is a National Chararacterset.Oracle DBA Interview Questions Most asked Oracle DBA Interview Questions. The horrorstory continues when you plan to use another database characterset, as - you guessed it - the national characterset will make this also more complicated.
#DATE DATATYPE IN ORACLE 10G HOW TO#
The idea of having different charactersets with possible characterset conversions and data loss in one database sounds complicated enough you'd have to worry everytime which datatype you have to use and how to convert it from characterset A to characterset B. The national characterset itself is simply there to support 2 different charactersets in your database meaning when having a West-European Database Characterset you could switch the national characterset to something else if you'd need to support something else quickly. 1.7K Training / Learning / CertificationĮmp_name nvarchar2(50) First of all ist the table column you are inserting your data also of type nvarchar2 ? The NVARCHAR2 uses the National Characterset whereas VARCHAR2 uses the database characterset which means you could have a characterset conversion with possible data loss at hand when trying to insert NVARCHAR2 into VARCHAR2 or vice versa.165.3K Java EE (Java Enterprise Edition).7.8K Oracle Database Express Edition (XE).3.7K Java and JavaScript in the Database.