Implicit and explicit methods are used to insert null or empty values into columns. Relational operators compare values and return true or false based on equal, not equal, greater than, less than comparisons. Logical operators return true if conditions joined by AND, OR, or NOT are met. Values can be sorted in ascending order based on their type as either lowest to highest numeric, alphabetical character, or earliest to latest date.

11. Methods Syntax
Implicit methods The column’s name is omitted from the column list in an INSERT statement.
Explicit methods The null value is used as a value for a numeric column, and an empty string (‘ ’) is used
for date or character columns.

20. Relational Operators Meaning
= Equal to
<> Or != Not equal to
> Greater than
>= Greater than or equal to
< Less than
<= Less than or equal to
AND, OR

37. Operator Use
* Multiplication
/ Division
+ Addition
- Subtraction

42. Logical Operator Meaning
AND Returns TRUE only if both conditions are true.
OR Returns TRUE one or both conditions are true.
NOT Returns TRUE if the conditions is false.
Operator Meaning
IS NULL It is a null value
BETWEEN….AND Is between a range of values
IN Match any value from a list
LIKE Match a value using wild cards

51. Type of Value Ascending Sort Order
Numeric Lowest to highest value
Character Alphabetical order
Date Earliest to latest date