SQLite

**     COPY
**     VACUUM
**     BEGIN TRANSACTION
**     COMMIT
**     ROLLBACK
**     PRAGMA
**
** $Id: build.c,v 1.76 2002/02/18 22:49:59 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>

/*
** This routine is called after a single SQL statement has been
** parsed and we want to execute the VDBE code to implement 

      { OP_SetCookie,  0, 0,        0}, /* 9 */
      { OP_Close,      0, 0,        0},
    };
    Index *pIdx;
    sqliteBeginWriteOperation(pParse);
    if( !pTable->isTemp ){
      base = sqliteVdbeAddOpList(v, ArraySize(dropTable), dropTable);
      sqliteVdbeChangeP3(v, base+2, pTable->zName, 0);
      changeCookie(db);
      sqliteVdbeChangeP1(v, base+9, db->next_cookie);
    }
    sqliteVdbeAddOp(v, OP_Destroy, pTable->tnum, pTable->isTemp);
    for(pIdx=pTable->pIndex; pIdx; pIdx=pIdx->pNext){
      sqliteVdbeAddOp(v, OP_Destroy, pIdx->tnum, pTable->isTemp);
    }

**
*************************************************************************
** This file contains SQLite's grammar for SQL.  Process this file
** using the lemon parser generator to generate C code that runs
** the parser.  Lemon will also generate a header file containing
** numeric codes for all of the tokens.
**
** @(#) $Id: parse.y,v 1.52 2002/02/18 22:49:59 drh Exp $
*/
%token_prefix TK_
%token_type {Token}
%default_type {Token}
%extra_argument {Parse *pParse}
%syntax_error {
  sqliteSetString(&pParse->zErrMsg,"syntax error",0);

%type select {Select*}
%destructor select {sqliteSelectDelete($$);}
%type oneselect {Select*}
%destructor oneselect {sqliteSelectDelete($$);}

select(A) ::= oneselect(X).                      {A = X;}
select(A) ::= select(X) multiselect_op(Y) oneselect(Z).  {
  if( Z ){
    Z->op = Y;
    Z->pPrior = X;
  }
  A = Z;
}
%type multiselect_op {int}
multiselect_op(A) ::= UNION.      {A = TK_UNION;}
multiselect_op(A) ::= UNION ALL.  {A = TK_ALL;}
multiselect_op(A) ::= INTERSECT.  {A = TK_INTERSECT;}
multiselect_op(A) ::= EXCEPT.     {A = TK_EXCEPT;}
oneselect(A) ::= SELECT distinct(D) selcollist(W) from(X) where_opt(Y)
                 groupby_opt(P) having_opt(Q) orderby_opt(Z) limit_opt(L). {
  A = sqliteSelectNew(W,X,Y,P,Q,Z,D,L.a,L.b);
}

// The "distinct" nonterminal is true (1) if the DISTINCT keyword is
// present and false (0) if it is not.

**    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 1.36 2002/02/18 22:49:59 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.

  ** loop where i==0 is the outer loop and i==pTabList->nId-1 is the inner
  ** loop. 
  **
  ** If terms exist that use the ROWID of any table, then set the
  ** iDirectEq[], iDirectLt[], or iDirectGt[] elements for that table
  ** to the index of the term containing the ROWID.  We always prefer
  ** to use a ROWID which can directly access a table rather than an
  ** index which requires reading an index first to get the rowid then
  ** doing a second read of the actual database table.
  **
  ** Actually, if there are more than 32 tables in the join, only the
  ** first 32 tables are candidates for indices.  This is (again) due
  ** to the limit of 32 bits in an integer bitmask.
  */
  loopMask = 0;
  for(i=0; i<pTabList->nId && i<ARRAYSIZE(aDirect); i++){
    int j;
    int idx = aOrder[i];
    Table *pTab = pTabList->a[idx].pTab;
    Index *pIdx;

    with MS-Access.</li>
<li>Added support for sub-queries in the FROM clause of a SELECT.</li>
<li>More efficient implementation of sqliteFileExists() under Windows.
    (by Joel Luscy)</li>
<li>The VALUES clause of an INSERT can now contain expressions, including
    scalar SELECT clauses.</li>
<li>Added support for CREATE TABLE AS SELECT</li>
<li>Bug fix: Creating and dropping a table all within a single
    transaction was not working.</li>
}

chng {2002 Feb 14 (2.3.2)} {
<li>Bug fix: There was an incorrect assert() in pager.c.  The real code was
    all correct (as far as is known) so everything should work OK if you
    compile with -DNDEBUG=1.  But without disability the assertions, there
    could be a fault.</li>