Description
The function 
sql-expression
 generates an SQL expression from the given keywords.
Valid combinations of the arguments are:
- 
string
 
- 
table
 
- 
table
 and 
alias 
- 
table
 and 
attribute
- 
table, attribute,
 and 
type
- 
table
 or 
alias,
 and 
attribute
- 
table
 or 
alias, 
and 
attribute
 and 
type
- 
attribute
 
- 
attribute
 and 
type