Does interval day to second store a period of time?
INTERVAL DAY TO SECOND stores a period of time in terms of days, hours, minutes, and seconds.
This data type is useful for representing the precise difference between two datetime values. day_precision is the number of digits in the DAY datetime field.
Accepted values are 0 to 9..
What is the elements column defined as?
The \x26lt;col\x26gt; HTML element defines a column within a table and is used for defining common semantics on all common cells.
It is generally found within a \x26lt;colgroup\x26gt; element..
What is the timestamp data type allows?
The TIMESTAMP data type is used for values that contain both date and time parts.
TIMESTAMP has a range of '1970-01-01 00:00:01' UTC to '2038-01-19 03:14:07' UTC.
A DATETIME or TIMESTAMP value can include a trailing fractional seconds part in up to microseconds (6 digits) precision..
When should you use the set unused command?
The main advantage of setting a column to UNUSED is to reduce possible high database load when dropping a column from a large table.
To overcome this issue, a column can be marked as unused and then be physically dropped later.
To set a column as unused, use the SET UNUSED clause..
Which command could you use to quickly remove all data from the rows in a table without deleting the table itself?
The TRUNCATE TABLE command deletes the data inside a table, but not the table itself..
Which data types stores variable-length character data?
The VARCHAR2 datatype stores variable-length character strings.
When you create a table with a VARCHAR2 column, you specify a maximum string length (in bytes, not characters) between 1 and 4000 for the VARCHAR2 column..
- Oracle has 8 character datatypes CHAR, NCHAR, VARCHAR, VARCHAR2, and NVARCHAR, CLOB, NCLOB, and LONG.
CHAR and VARCHAR2 are more important.
VARCHAR2 is used to store variable-length character strings, while CHAR is used to store fixed-length character strings. - The main advantage of setting a column to UNUSED is to reduce possible high database load when dropping a column from a large table.
To overcome this issue, a column can be marked as unused and then be physically dropped later.
To set a column as unused, use the SET UNUSED clause. - The TIMESTAMP data type is used for values that contain both date and time parts.
TIMESTAMP has a range of '1970-01-01 00:00:01' UTC to '2038-01-19 03:14:07' UTC.
A DATETIME or TIMESTAMP value can include a trailing fractional seconds part in up to microseconds (6 digits) precision.
