253           i16 iCol = pIdx->aiColumn[i];     /* Index of column in parent tbl */  in sqlite3FkLocateIndex()  local
257           if( iCol<0 ) break; /* No foreign keys against expression indexes */  in sqlite3FkLocateIndex()
262           zDfltColl = sqlite3ColumnColl(&pParent->aCol[iCol]);  in sqlite3FkLocateIndex()
266           zIdxCol = pParent->aCol[iCol].zCnName;  in sqlite3FkLocateIndex()
475   i16 iCol           /* Which column of pTab is desired */  in exprTableRegister()  argument
484     if( iCol>=0 && iCol!=pTab->iPKey ){  in exprTableRegister()
485       pCol = &pTab->aCol[iCol];  in exprTableRegister()
486       pExpr->iTable = regBase + sqlite3TableColumnToStorage(pTab,iCol) + 1;  in exprTableRegister()
507   i16 iCol          /* The column that is wanted */  in exprTableColumn()  argument
514     pExpr->iColumn = iCol;  in exprTableColumn()
587     i16 iCol;                     /* Index of column in child table */   in fkScanChildren()  local
590     iCol = pIdx ? pIdx->aiColumn[i] : -1;  in fkScanChildren()
591     pLeft = exprTableRegister(pParse, pTab, regData, iCol);  in fkScanChildren()
592     iCol = aiCol ? aiCol[i] : pFKey->aCol[0].iFrom;  in fkScanChildren()
593     assert( iCol>=0 );  in fkScanChildren()
594     zCol = pFKey->pFrom->aCol[iCol].zCnName;  in fkScanChildren()
626         i16 iCol = pIdx->aiColumn[i];  in fkScanChildren()  local
627         assert( iCol>=0 );  in fkScanChildren()
628         pLeft = exprTableRegister(pParse, pTab, regData, iCol);  in fkScanChildren()
629         pRight = sqlite3Expr(db, TK_ID, pTab->aCol[iCol].zCnName);  in fkScanChildren()
918     int iCol;  in sqlite3FkCheck()  local
966       iCol = pFKey->aCol[0].iFrom;  in sqlite3FkCheck()
967       aiCol = &iCol;  in sqlite3FkCheck()