} null {}
do_expr_test e_expr-35.1.6 { 
  (SELECT a FROM t2 UNION SELECT COALESCE(b, 55) FROM t2 ORDER BY 1)
} integer 4

# EVIDENCE-OF: R-46899-53765 A SELECT used as a scalar quantity must
# return a result set with a single column.



#
set M {only a single result allowed for a SELECT that is part of an expression}
foreach {tn sql} {
  1     { SELECT (SELECT * FROM t2 UNION SELECT a+1, b+1 FROM t2) }
  2     { SELECT (SELECT * FROM t2 UNION SELECT a+1, b+1 FROM t2 ORDER BY 1) }
  3     { SELECT (SELECT 1, 2) }
  4     { SELECT (SELECT NULL, NULL, NULL) }
  5     { SELECT (SELECT * FROM t2) }
  6     { SELECT (SELECT * FROM (SELECT 1, 2, 3)) }
} {
  do_catchsql_test e_expr-35.2.$tn $sql [list 1 $M]
}








































finish_test

} null {}
do_expr_test e_expr-35.1.6 { 
  (SELECT a FROM t2 UNION SELECT COALESCE(b, 55) FROM t2 ORDER BY 1)
} integer 4

# EVIDENCE-OF: R-46899-53765 A SELECT used as a scalar quantity must
# return a result set with a single column.
#
# The following block tests that errors are returned in a bunch of cases
# where a subquery returns more than one column.
#
set M {only a single result allowed for a SELECT that is part of an expression}
foreach {tn sql} {
  1     { SELECT (SELECT * FROM t2 UNION SELECT a+1, b+1 FROM t2) }
  2     { SELECT (SELECT * FROM t2 UNION SELECT a+1, b+1 FROM t2 ORDER BY 1) }
  3     { SELECT (SELECT 1, 2) }
  4     { SELECT (SELECT NULL, NULL, NULL) }
  5     { SELECT (SELECT * FROM t2) }
  6     { SELECT (SELECT * FROM (SELECT 1, 2, 3)) }
} {
  do_catchsql_test e_expr-35.2.$tn $sql [list 1 $M]
}

# EVIDENCE-OF: R-35764-28041 The result of the expression is the value
# of the only column in the first row returned by the SELECT statement.
#
# EVIDENCE-OF: R-41898-06686 If the SELECT yields more than one result
# row, all rows after the first are ignored.
#
do_execsql_test e_expr-36.3.1 {
  CREATE TABLE t4(x, y);
  INSERT INTO t4 VALUES(1, 'one');
  INSERT INTO t4 VALUES(2, 'two');
  INSERT INTO t4 VALUES(3, 'three');
} {}

foreach {tn expr restype resval} {
    2  { ( SELECT x FROM t4 ORDER BY x )      }        integer 1
    3  { ( SELECT x FROM t4 ORDER BY y )      }        integer 1
    4  { ( SELECT x FROM t4 ORDER BY x DESC ) }        integer 3
    5  { ( SELECT x FROM t4 ORDER BY y DESC ) }        integer 2
    6  { ( SELECT y FROM t4 ORDER BY y DESC ) }        text    two

    7  { ( SELECT sum(x) FROM t4 )           }         integer 6
    8  { ( SELECT group_concat(y,'') FROM t4 ) }       text    onetwothree
    9  { ( SELECT max(x) FROM t4 WHERE y LIKE '___') } integer 2 

} {
  do_expr_test e_expr-36.3.$tn $expr $restype $resval
}

# EVIDENCE-OF: R-25492-41572 If the SELECT yields no rows, then the
# value of the expression is NULL.
#
foreach {tn expr} {
    1  { ( SELECT x FROM t4 WHERE x>3 ORDER BY x )      }
    2  { ( SELECT x FROM t4 WHERE y<'one' ORDER BY y )  }
} {
  do_expr_test e_expr-36.4.$tn $expr null {}
}


finish_test