SQLite

**     COPY
**     VACUUM
**     BEGIN TRANSACTION
**     COMMIT
**     ROLLBACK
**     PRAGMA
**
** $Id: build.c,v 1.117 2002/12/03 02:22:52 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>

/*
** This routine is called when a new SQL statement is beginning to
** be parsed.  Check to see if the schema for the database needs

  sqliteStartTable(pParse, pBegin, pName, isTemp);
  p = pParse->pNewTable;
  if( p==0 ){
    sqliteSelectDelete(pSelect);
    return;
  }





  /* Make a copy of the entire SELECT statement that defines the view.
  ** This will force all the Expr.token.z values to be dynamically
  ** allocated rather than point to the input string - which means that
  ** they will persist after the current sqlite_exec() call returns.
  */
  p->pSelect = sqliteSelectDup(pSelect);
  sqliteSelectDelete(pSelect);

**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains C code routines that are called by the parser
** to handle SELECT statements in SQLite.
**
** $Id: select.c,v 1.116 2002/12/03 02:22:52 drh Exp $
*/
#include "sqliteInt.h"


/*
** Allocate a new Select structure and return a pointer to that
** structure.

**
**   (9)  The subquery does not use LIMIT or the outer query does not use
**        aggregates.
**
**  (10)  The subquery does not use aggregates or the outer query does not
**        use LIMIT.
**
**  (11)  The subquery and the outer query do not both have ORDER BY clauses.
**
** In this routine, the "p" parameter is a pointer to the outer query.
** The subquery is p->pSrc->a[iFrom].  isAgg is true if the outer query
** uses aggregates and subqueryIsAgg is true if the subquery uses aggregates.
**
** If flattening is not attempted, this routine is a no-op and return 0.
** If flattening is attempted this routine returns 1.
**

  pSubSrc = pSub->pSrc;
  assert( pSubSrc );
  if( pSubSrc->nSrc!=1 ) return 0;
  if( (pSub->isDistinct || pSub->nLimit>=0) &&  (pSrc->nSrc>1 || isAgg) ){
     return 0;
  }
  if( (p->isDistinct || p->nLimit>=0) && subqueryIsAgg ) return 0;
  if( p->pOrderBy && pSub->pOrderBy ) return 0;

  /* If we reach this point, it means flattening is permitted for the
  ** i-th entry of the FROM clause in the outer query.
  */
  iParent = p->base + iFrom;
  iSub = pSub->base;
  substExprList(p->pEList, iParent, pSub->pEList, iSub);
  pList = p->pEList;
  for(i=0; i<pList->nExpr; i++){
    Expr *pExpr;
    if( pList->a[i].zName==0 && (pExpr = pList->a[i].pExpr)->span.z!=0 ){
      pList->a[i].zName = sqliteStrNDup(pExpr->span.z, pExpr->span.n);
    }
  }
  if( isAgg ){
    substExprList(p->pGroupBy, iParent, pSub->pEList, iSub);
    substExpr(p->pHaving, iParent, pSub->pEList, iSub);
  }
  if( pSub->pOrderBy ){
    assert( p->pOrderBy==0 );
    p->pOrderBy = pSub->pOrderBy;
    pSub->pOrderBy = 0;
    changeTablesInList(p->pOrderBy, iSub, iParent);
  }else if( p->pOrderBy ){
    substExprList(p->pOrderBy, iParent, pSub->pEList, iSub);
  }
  if( pSub->pWhere ){
    pWhere = sqliteExprDup(pSub->pWhere);
    if( iParent!=iSub ){
      changeTables(pWhere, iSub, iParent);
    }
  }else{
    pWhere = 0;

**    May you share freely, never taking more than you give.
**
*************************************************************************
** This module contains C code that generates VDBE code used to process
** the WHERE clause of SQL statements.  Also found here are subroutines
** to generate VDBE code to evaluate expressions.
**
** $Id: where.c,v 1.67 2002/12/03 02:22:52 drh Exp $
*/
#include "sqliteInt.h"

/*
** The query generator uses an array of instances of this structure to
** help it analyze the subexpressions of the WHERE clause.  Each WHERE
** clause subexpression is separated from the others by an AND operator.

    int bestScore = 0;

    /* Check to see if there is an expression that uses only the
    ** ROWID field of this table.  For terms of the form ROWID==expr
    ** set iDirectEq[i] to the index of the term.  For terms of the
    ** form ROWID<expr or ROWID<=expr set iDirectLt[i] to the term index.
    ** For terms like ROWID>expr or ROWID>=expr set iDirectGt[i].
    **
    ** (Added:) Treat ROWID IN expr like ROWID=expr.
    */
    pWInfo->a[i].iCur = -1;
    iDirectEq[i] = -1;
    iDirectLt[i] = -1;
    iDirectGt[i] = -1;
    for(j=0; j<nExpr; j++){
      if( aExpr[j].idxLeft==idx && aExpr[j].p->pLeft->iColumn<0

  for(i=0; i<pTabList->nSrc; i++){
    int j, k;
    int idx = aOrder[i];
    Index *pIdx;
    WhereLevel *pLevel = &pWInfo->a[i];

    /* If this is the right table of a LEFT OUTER JOIN, allocate and
    ** initialize a memory cell that records if this table matches any
    ** row of the left table of the join.
    */
    if( i>0 && (pTabList->a[i-1].jointype & JT_LEFT)!=0 ){
      if( !pParse->nMem ) pParse->nMem++;
      pLevel->iLeftJoin = pParse->nMem++;
      sqliteVdbeAddOp(v, OP_String, 0, 0);
      sqliteVdbeAddOp(v, OP_MemStore, pLevel->iLeftJoin, 1);

# 2002 February 26
#
# 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 VIEW statements.
#
# $Id: view.test,v 1.12 2002/12/03 02:22:53 drh Exp $
set testdir [file dirname $argv0]
source $testdir/tester.tcl

do_test view-1.0 {
  execsql {
    CREATE TABLE t1(a,b,c);
    INSERT INTO t1 VALUES(1,2,3);

  }
} 3
do_test view-8.5 {
  execsql {
    SELECT mx+10, mx*2 FROM v8;
  }
} {13 6}

# Tests for a bug found by Michiel de Wit involving ORDER BY in a VIEW.
#
do_test view-9.1 {
  execsql {
    INSERT INTO t2 SELECT * FROM t2 WHERE a<5;
    INSERT INTO t2 SELECT * FROM t2 WHERE a<4;
    INSERT INTO t2 SELECT * FROM t2 WHERE a<3;
    SELECT DISTINCT count(*) FROM t2 GROUP BY a ORDER BY 1;
  }
} {1 2 4 8}
do_test view-9.2 {
  execsql {
    SELECT DISTINCT count(*) FROM t2 GROUP BY a ORDER BY 1 LIMIT 3;
  }
} {1 2 4}
do_test view-9.3 {
  execsql {
    CREATE VIEW v9 AS 
       SELECT DISTINCT count(*) FROM t2 GROUP BY a ORDER BY 1 LIMIT 3;
    SELECT * FROM v9;
  }
} {1 2 4}
do_test view-9.4 {
  execsql {
    SELECT * FROM v9 ORDER BY 1 DESC;
  }
} {4 2 1}
do_test view-9.5 {
  execsql {
    CREATE VIEW v10 AS 
       SELECT DISTINCT a, count(*) FROM t2 GROUP BY a ORDER BY 2 LIMIT 3;
    SELECT * FROM v10;
  }
} {5 1 4 2 3 4}
do_test view-9.6 {
  execsql {
    SELECT * FROM v10 ORDER BY 1;
  }
} {3 4 4 2 5 1}


finish_test