How to compare dates in oracle?There are a number of ways you can compare two dates in oracle to check which is greater or which is small.This is particularly useful when we do operations based on certain date conditions.This is used along with to_date and other date functions.
ORA-01882: TIMEZONE REGION NOT FOUND. This error occurs when timezone region string not found.The specified region name was not found.There are a number of time zone constants defined in oracle to use.See the last part of this post to know hoe to get the defined time zone constants in your oracle database.
The EXTRACT function extracts and returns the value of a specified datetime field from a datetime.It can also be used for extracting specified value from an interval value expression.
The DATE type is stored in a special internal format that includes not just the month, day, and year, but also the hour, minute, and second.There are a number of key words and functions provided by oracle to use the date and timestamp data types in much flexible ways.
The purpose of TO_DATE in Oracle pl/sql is to convert char of CHAR, VARCHAR2, NCHAR, or NVARCHAR2 data type to a value of DATE datatype.Or more generically the Oracle to_date function is used to change a test string (or variable) into an internal date format.
Oracle maintains the SYSDATE pseudo-column to show the current system date and time.
How to find the difference between two dates in Oracle? The following examples gives different useful methods to do this.
In Oracle Date data is stored in fixed-length fields of seven bytes each, corresponding to century, year, month, day, hour, minute, and second. (Also Read Formatting date in SQL (Oracle) -Simple date forma…) .
Before going through this article it will be helpful to read SQL – Transaction Statements -Transaction Management… and Savepoints In SQL Transactions. – SAVEPOINT to know more about SQL transactions.
Autonomous transactions are independent transactions that can be called from within another transaction.
A Transaction ensures that the action of a group of statements is atomic.A transaction is a logical unit of work that contains one or more SQL statements.The effects of all the SQL statements in a transaction can be either all committed or all rolled back.
Savepoints In SQL Transactions. – Oracle SAVEPOINT.
The intermediate markers within the context of a transaction called savepoints. Savepoints divide a long transaction into smaller parts.