1 decode

It changes the value of an expression if it is equal to one of the searched values.

<decode
    when='when'
    cond='cond'
    then='then'
    else='else'
/>

Attributes
Name	Type	Required	Default	Description
Awhen	string				Value to which the condition applies.
Acond	string				Condition value.
Athen	string				Value that applies if the condition is true.
Aelse	string				Value that applies if the condition is not true.

Example

Copy

<select>
   <columns>
      <decode when='deptno' cond='10' then='ACCOUNTING' else='NONE'/>
   </columns>
   <from table='test'/>
</select>

2 nvl

This tag is used to convert an expression that evaluates as NULL to the value specified.

<nvl>
    <expresion /> *
</nvl>

Arguments
Name	Type	Required	Unique	Nullable	Description
Eexpresion	string				The value or expression to be evaluate and the value to return separated by comma.

Example

If 'salario' is null, the value 0 must be returned.

Copy

<select>
   <columns>
      <nvl>salario,0</nvl>
   </columns>
   <from table='empleados'/>
</select>