SQLite

**
** New flags may be added in future releases of SQLite.
**
** <dl>
** [[SQLITE_PREPARE_PERSISTENT]] ^(<dt>SQLITE_PREPARE_PERSISTENT</dt>
** <dd>The SQLITE_PREPARE_PERSISTENT flag is a hint to the query planner
** that the prepared statement will be retained for a long time and
** probably reused many times.)^ ^Without this flag, [sqlite3_prepare_v3()]
** and [sqlite3_prepare16_v3()] assume that the prepared statement will 
** be used just once or at most a few times and then destroyed using
** [sqlite3_finalize()] relatively soon. The current implementation acts
** on this hint by avoiding the use of [lookaside memory] so as not to
** deplete the limited store of lookaside memory. Future versions of
** SQLite may act on this hint differently.
** </dl>

  
  do_execsql_test e_expr-5.$tn "SELECT $a || $b" [list "${as}${bs}"]
}

#-------------------------------------------------------------------------
# Test the % operator.
#
# EVIDENCE-OF: R-04223-04352 The operator % outputs the integer value of
# its left operand modulo its right operand.
#
do_execsql_test e_expr-6.1 {SELECT  72%5}  {2}
do_execsql_test e_expr-6.2 {SELECT  72%-5} {2}
do_execsql_test e_expr-6.3 {SELECT -72%-5} {-2}
do_execsql_test e_expr-6.4 {SELECT -72%5}  {-2}
do_execsql_test e_expr-6.5 {SELECT 72.35%5} {2.0}

#-------------------------------------------------------------------------
# Test that the results of all binary operators are either numeric or 
# NULL, except for the || operator, which may evaluate to either a text
# value or NULL.
#
# EVIDENCE-OF: R-20665-17792 The result of any binary operator is either

# application from preparing SQL statements that modify the content of
# the child or parent tables in ways that use the foreign keys.
#
# EVIDENCE-OF: R-03108-63659 The English language error message for
# foreign key DML errors is usually "foreign key mismatch" but can also
# be "no such table" if the parent table does not exist.
#
# EVIDENCE-OF: R-35763-48267 Foreign key DML errors are reported if: The
# parent table does not exist, or The parent key columns named in the
# foreign key constraint do not exist, or The parent key columns named
# in the foreign key constraint are not the primary key of the parent
# table and are not subject to a unique constraint using collating
# sequence specified in the CREATE TABLE, or The child table references
# the primary key of the parent without specifying the primary key
# columns and the number of primary key columns in the parent do not
# match the number of child key columns.
#
do_test e_fkey-20.1 {
  execsql {
    CREATE TABLE c1(c REFERENCES nosuchtable, d);

    CREATE TABLE p2(a, b, UNIQUE(a, b));
    CREATE TABLE c2(c, d, FOREIGN KEY(c, d) REFERENCES p2(a, x));

    5.1    "INSERT INTO a1 DEFAULT VALUES"     {}
    5.2    "SELECT * FROM a1"                  {{} {}}

    6.1    "INSERT INTO a1 DEFAULT VALUES"     {}
    6.2    "SELECT * FROM a1"                  {{} {} {} {}}
}

# EVIDENCE-OF: R-00267-47727 The initial "INSERT" keyword can be
# replaced by "REPLACE" or "INSERT OR action" to specify an alternative
# constraint conflict resolution algorithm to use during that one INSERT
# command.
#
# EVIDENCE-OF: R-23110-47146 the parser allows the use of the single
# keyword REPLACE as an alias for "INSERT OR REPLACE".
#
#    The two requirements above are tested by e_select-4.1.* and
#    e_select-4.2.*, respectively.
#