SQLite

**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains routines used for analyzing expressions and
** for generating VDBE code that evaluates expressions in SQLite.
**
** $Id: expr.c,v 1.301 2007/07/23 22:51:15 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>

/*
** Return the 'affinity' of the expression pExpr if any.
**

    ** Note that the expression in the result set should have already been
    ** resolved by the time the WHERE clause is resolved.
    */
    if( cnt==0 && (pEList = pNC->pEList)!=0 && zTab==0 ){
      for(j=0; j<pEList->nExpr; j++){
        char *zAs = pEList->a[j].zName;
        if( zAs!=0 && sqlite3StrICmp(zAs, zCol)==0 ){
          Expr *pDup, *pOrig;
          assert( pExpr->pLeft==0 && pExpr->pRight==0 );
          assert( pExpr->pList==0 );
          assert( pExpr->pSelect==0 );
          pOrig = pEList->a[j].pExpr;
          if( !pNC->allowAgg && ExprHasProperty(pOrig, EP_Agg) ){
            sqlite3ErrorMsg(pParse, "misuse of aliased aggregate %s", zAs);
            sqliteFree(zCol);
            return 2;
          }
          pDup = sqlite3ExprDup(pOrig);
          if( pExpr->flags & EP_ExpCollate ){
            pDup->pColl = pExpr->pColl;
            pDup->flags |= EP_ExpCollate;
          }
          if( pExpr->span.dyn ) sqliteFree((char*)pExpr->span.z);
          if( pExpr->token.dyn ) sqliteFree((char*)pExpr->token.z);
          memcpy(pExpr, pDup, sizeof(*pExpr));

# 2001 September 15
#
# The author disclaims copyright to this source code.  In place of
# a legal notice, here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#***********************************************************************
# This file implements regression tests for SQLite library.  The
# focus of this file is testing the SELECT statement.
#
# $Id: select1.test,v 1.54 2007/07/23 22:51:15 drh Exp $

set testdir [file dirname $argv0]
source $testdir/tester.tcl

# Try to select on a non-existant table.
#
do_test select1-1.1 {

  lappend v $msg
} {0 44}
do_test select1-2.20 {
  set v [catch {execsql {SELECT SUM(min(f1)) FROM test1}} msg]
  lappend v $msg
} {1 {misuse of aggregate function min()}}

# Ticket #2526
#
do_test select1-2.21 {
  catchsql {
     SELECT min(f1) AS m FROM test1 GROUP BY f1 HAVING max(m+5)<10
  }
} {1 {misuse of aliased aggregate m}}
do_test select1-2.22 {
  catchsql {
     SELECT coalesce(min(f1)+5,11) AS m FROM test1
      GROUP BY f1
     HAVING max(m+5)<10
  }
} {1 {misuse of aliased aggregate m}}
do_test select1-2.23 {
  execsql {
    CREATE TABLE tkt2526(a,b,c PRIMARY KEY);
    INSERT INTO tkt2526 VALUES('x','y',NULL);
    INSERT INTO tkt2526 VALUES('x','z',NULL);
  }
  catchsql {
    SELECT count(a) AS cn FROM tkt2526 GROUP BY a HAVING cn<max(cn)
  }
} {1 {misuse of aliased aggregate cn}}

# WHERE clause expressions
#
do_test select1-3.1 {
  set v [catch {execsql {SELECT f1 FROM test1 WHERE f1<11}} msg]
  lappend v $msg
} {0 {}}
do_test select1-3.2 {