native barcode generator for crystal reports crack DATABASE TABLES in Objective-C

Draw Data Matrix 2d barcode in Objective-C DATABASE TABLES

CHAPTER 10 DATABASE TABLES
Data Matrix ECC200 Printer In Objective-C
Using Barcode generator for iPhone Control to generate, create DataMatrix image in iPhone applications.
www.OnBarcode.com
UPC A Creation In Objective-C
Using Barcode printer for iPhone Control to generate, create UPC Code image in iPhone applications.
www.OnBarcode.com
6 from ( 7 select dbms_rowid.rowid_block_number(dept.rowid) dept_blk, 8 dbms_rowid.rowid_block_number(emp.rowid) emp_blk, 9 dept.deptno 10 from emp, dept 11 where emp.deptno = dept.deptno 12 ) 13 ) 14 where flag = '*' 15 order by deptno 16 / no rows selected That was exactly our goal to get every row in the EMP table stored on the same block as the corresponding DEPT row. But what would have happened if we estimated incorrectly, what if 1024 was insufficient What if some of our departments were close to 1024 and others exceeded that value Then, obviously, the data could not fit on the same block and we d have to place some of the EMP records on a block separate from the DEPT record. We can see this easily by resetting our example above (I m starting with the tables as they were before the load above, right after creating them). When I load this time, we ll load every EMP record eight times, to multiply the number of employee records per each department: ops$tkyte%ORA11GR2> insert into dept 2 ( deptno, dname, loc ) 3 select deptno+r, dname, loc 4 from scott.dept, 5 (select level r from dual connect by level < 10); 36 rows created. ops$tkyte%ORA11GR2> insert into emp 2 (empno, ename, job, mgr, hiredate, sal, comm, deptno) 3 select rownum, ename, job, mgr, hiredate, sal, comm, deptno+r 4 from scott.emp, 5 (select level r from dual connect by level < 10), 6 (select level r2 from dual connect by level < 8); 882 rows created. ops$tkyte%ORA11GR2> ops$tkyte%ORA11GR2> select min(count(*)), max(count(*)), avg(count(*)) 2 from dept 3 group by dbms_rowid.rowid_block_number(rowid) 4 / MIN(COUNT(*)) MAX(COUNT(*)) AVG(COUNT(*)) ------------- ------------- ------------1 7 6 So far, it looks just like the prior example, but when we compare the blocks the EMP records are on to the blocks the DEPT records are on
Generate UPC - 13 In Objective-C
Using Barcode drawer for iPhone Control to generate, create European Article Number 13 image in iPhone applications.
www.OnBarcode.com
Paint Barcode In Objective-C
Using Barcode generator for iPhone Control to generate, create Barcode image in iPhone applications.
www.OnBarcode.com
CHAPTER 10 DATABASE TABLES
Data Matrix ECC200 Drawer In Objective-C
Using Barcode printer for iPhone Control to generate, create DataMatrix image in iPhone applications.
www.OnBarcode.com
QR Generation In Objective-C
Using Barcode creator for iPhone Control to generate, create QR Code ISO/IEC18004 image in iPhone applications.
www.OnBarcode.com
ops$tkyte%ORA11GR2> select * 2 from ( 3 select dept_blk, emp_blk, 4 case when dept_blk <> emp_blk then '*' end flag, 5 deptno 6 from ( 7 select dbms_rowid.rowid_block_number(dept.rowid) dept_blk, 8 dbms_rowid.rowid_block_number(emp.rowid) emp_blk, 9 dept.deptno 10 from emp, dept 11 where emp.deptno = dept.deptno 12 ) 13 ) 14 where flag = '*' 15 order by deptno 16 / DEPT_BLK EMP_BLK F DEPTNO ---------- ---------- - ---------523 554 * 12 523 554 * 12 526 554 * 39 526 554 * 39 45 rows selected. we can see there are 45 out of 882 EMP rows on a block separate and distinct from the block their corresponding DEPTNO is on in the DEPT table. Given that we undersized the cluster (the SIZE parameter was too small given our real life data), we could recreate it with a cluster SIZE of 1200 and then we would discover ops$tkyte%ORA11GR2> select min(count(*)), max(count(*)), avg(count(*)) 2 from dept 3 group by dbms_rowid.rowid_block_number(rowid) 4 / MIN(COUNT(*)) MAX(COUNT(*)) AVG(COUNT(*)) ------------- ------------- ------------6 6 6 ops$tkyte%ORA11GR2> ops$tkyte%ORA11GR2> select * 2 from ( 3 select dept_blk, emp_blk, 4 case when dept_blk <> emp_blk then '*' end flag, 5 deptno 6 from ( 7 select dbms_rowid.rowid_block_number(dept.rowid) dept_blk, 8 dbms_rowid.rowid_block_number(emp.rowid) emp_blk, 9 dept.deptno 10 from emp, dept 11 where emp.deptno = dept.deptno 12 )
Make Barcode In Objective-C
Using Barcode generator for iPhone Control to generate, create Barcode image in iPhone applications.
www.OnBarcode.com
EAN8 Printer In Objective-C
Using Barcode creation for iPhone Control to generate, create GTIN - 8 image in iPhone applications.
www.OnBarcode.com
CHAPTER 10 DATABASE TABLES
Scan Data Matrix 2d Barcode In None
Using Barcode scanner for Software Control to read, scan read, scan image in Software applications.
www.OnBarcode.com
ECC200 Generator In Java
Using Barcode generator for Android Control to generate, create ECC200 image in Android applications.
www.OnBarcode.com
13 14 15 16
UPC - 13 Generator In Java
Using Barcode printer for Java Control to generate, create GTIN - 13 image in Java applications.
www.OnBarcode.com
Read PDF-417 2d Barcode In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
) where flag = '*' order by deptno /
Quick Response Code Recognizer In Visual Basic .NET
Using Barcode recognizer for VS .NET Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
Encode PDF-417 2d Barcode In None
Using Barcode drawer for Microsoft Excel Control to generate, create PDF 417 image in Excel applications.
www.OnBarcode.com
no rows selected we only stored six DEPTNO values per block now, leaving sufficient room for all of the EMP data to be stored on the same block with their corresponding DEPT records. Here is a bit of puzzle to amaze and astound your friends with. Many people mistakenly believe a rowid uniquely identifies a row in a database, and that given a rowid you can tell what table the row came from. In fact, you cannot. You can and will get duplicate rowids from a cluster. For example, after executing the preceding code you should find: ops$tkyte%ORA11GR2> select rowid from emp 2 intersect 3 select rowid from dept; ROWID -----------------AAAWy1AAEAAAAILAAA AAAWy1AAEAAAAILAAB AAAWy1AAEAAAAIsAAD AAAWy1AAEAAAAIsAAE AAAWy1AAEAAAAIsAAF 36 rows selected. Every rowid assigned to the rows in DEPT has been assigned to the rows in EMP as well. That is because it takes a table and row ID to uniquely identify a row. The rowid pseudo-column is unique only within a table. I also find that many people believe the cluster object to be an esoteric object that no one really uses everyone just uses normal tables. In fact, you use clusters every time you use Oracle. Much of the data dictionary is stored in various clusters, for example: sys%ORA11GR2> break on cluster_name sys%ORA11GR2> select cluster_name, table_name 2 from user_tables 3 where cluster_name is not null 4 order by 1; CLUSTER_NAME TABLE_NAME ------------------------------ -----------------------------C_COBJ# CDEF$ CCOL$ C_FILE#_BLOCK# SEG$ UET$ C_MLOG# MLOG$ SLOG$ C_OBJ# SUBCOLTYPE$ NTAB$ REFCON$
Printing UPC Symbol In Objective-C
Using Barcode generation for iPad Control to generate, create GTIN - 12 image in iPad applications.
www.OnBarcode.com
Barcode Generator In None
Using Barcode generator for Software Control to generate, create Barcode image in Software applications.
www.OnBarcode.com
Making UCC-128 In .NET Framework
Using Barcode creator for Reporting Service Control to generate, create EAN128 image in Reporting Service applications.
www.OnBarcode.com
EAN 13 Decoder In Visual Basic .NET
Using Barcode scanner for .NET framework Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
Recognize UPC A In C#
Using Barcode scanner for Visual Studio .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
Decoding Barcode In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
Copyright © OnBarcode.com . All rights reserved.