SQL PROGRAMMING STYLE- P32 pptx
sql programming style - apr 2005
... and then
“Obtaining Permissions.”
Library of Congress Cataloging-in-Publication Data
Application submitted.
ISBN: 0-1 2-0 8879 7-5
For information on all Morgan Kaufmann publications,
visit our ... types: in SQL Server, DATETIME (their name
for TIMESTAMP data type) is a binary number internally (UNIX -style
system clock representation), but TIMESTAMP is a string of digits in
DB2...
SQL PROGRAMMING STYLE- P2 potx
... tables, 63
SQL
4GLs, 151, 152
bad programming in, 184–89
as declarative language, 193
Dynamic, 168–70
injection, 169–70
Standard, 4, 5, 6, 7, 118
testing, 130–31
thinking in, 183–95
SQL- 92
CASE ... 3
quoted identifiers, 5
string operators, 108
SQL- 99, 3
Stamp coupling, 156
Standard functions, 108
Standard Industrial Classification
(SIC), 14
Standard SQL
case-sensitivity rules, 6, 7...
SQL PROGRAMMING STYLE- P3 ppsx
...
system, 89–90
Display, 96
Domain-Key Normal Form (DKNF),
62–63
DROP TABLE statement, 67
Dynamic SQL, 168–70
purpose, 168
in stored procedures, 169
E
Electronic data interchange (EDI) files,
SQL PROGRAMMING STYLE- P4 pdf
... about Student Programming Practices,”
Structured Programming
, Fall 1989, p. 215.
Celko, J.
SQL for Smarties
(3rd ed.). San Francisco: Morgan-Kaufmann,
2005.
Celko, J.
SQL Puzzles ... of Programming Style
.
Boston: McGraw-Hill, 1982.
Ledgard, H.
Programming Prover
bs. Rochelle Park, NJ, Hayden Books,
1975.
Ledgard, H., and L. J. Chmura.
Fortran with Style:...
SQL PROGRAMMING STYLE- P6 pdf
... the count is redundant; SQL is
orthogonal, and the scalar subquery can be used wherever the scalar
variable is used.
Rows are not records and columns are not fields. SQL is a declarative
language, ... TIMESTAMP,—null means current
CHECK(in_time < out_time),
PRIMARY KEY (user_id, in_time));
Many new SQL programmers are scared of NULLs, but this is a good
use of them. We do not...
SQL PROGRAMMING STYLE- P7 ppt
... used SQL/ PSM to mimic the classic COBOL
program for this kind of summary.
Without repeating a dozen columns again, a set-oriented solution is
this:
CREATE PROCEDURE SurveySummary()
LANGUAGE SQL
BEGIN
DELETE ...
original schema lacked keys and constraints that had to be added to give
us this:
10.1 Bad Programming in SQL and Procedural Languages 187
but it at least follows the...
SQL PROGRAMMING STYLE- P8 potx
... procedural programming! SQL will not make
up for a lack of programming skills. In fact, the bad effects of mimicking
3GL languages in SQL are magnified. The optimizers and compilers in
SQL engines ... reasoning.
10.1 Bad Programming in SQL and Procedural Languages
As an example of not learning any relational approaches to a problem,
consider a posting in the comp.databases...
SQL PROGRAMMING STYLE- P9 pdf
... tell what is good and what is bad in
SQL. The procedural programmers had a deterministic environment in
which the same program ran the same way every time. SQL decides how
to execute a query ... front did not know
this. Would you like to pick which four children will die because of
sloppy programming? See what we mean by the last sentence in
Ledgard’s quote?
9.6.2 Save Your First ....
SQL PROGRAMMING STYLE- P10 potx
... almost write itself.
9.2 Add the Words “Set of All…” in Front of the Nouns
The big leap in SQL programming is thinking in sets and not in process
steps that handle one unit of data at a time. ...
still get multiple couples on the dance floor. This is where some
experience with SQL helps. One of the customary programming tricks is
to use a self-join to get a ranking of elements...
SQL PROGRAMMING STYLE- P12 ppt
... following statement is the
first impulse of most new SQL programmers, but it does not work.
CREATE PROCEDURE IncreasePrices()
LANGUAGE SQL
DETERMINISTIC
BEGIN
UPDATE Books
SET price = price ...
CREATE TABLE Sequence (seq INTEGER NOT NULL PRIMARY KEY);
CREATE PROCEDURE MakeSequence()
LANGUAGE SQL
DETERMINISTIC
INSERT INTO Sequence (seq)
SELECT hundred * 100 + ten * 10 + unit + 1
FR...
SQL PROGRAMMING STYLE- P13 doc
... specifications were
never explained beyond that. He posted a pseudocode
program in T -SQL dialect, which would translate into Standard
SQL pseudocode something like this:
CREATE PROCEDURE TapeFileRoutine()
BEGIN
... overwhelming reason is ignorance
of SQL and old habits. The cursors in SQL are modeled after tape file
semantics, and people know that kind of procedural programmin...
SQL PROGRAMMING STYLE- P14 pdf
... revolution and have
reverted back to ad hoc programming but call it “extreme” or “agile”
these days to make sloppy programming sound better.
In classic structured programming, you have three control ... do, and it is why
SQL is also known as a functional language.
Procedural, communicational, informational, and functional
cohesion are a bit more complicated in SQL than in 3GL pro...
SQL PROGRAMMING STYLE- P26 pptx
... table quickly collects garbage.
CHAR(n) data often has advantages for access and storage
in many SQL products. Numeric encodings can take advantage
of arithmetic operators for ranges, check digits, ... CHECK (CASE WHEN code_type = <type 1>
AND <validation 1>
THEN 1
—assume that your SQL product can support a huge
CASE expression
WHEN code_type = <type n>
5.3 Gen...
SQL PROGRAMMING STYLE- P32 pptx
... example of having a column in a table
change domain on the fly on September 29, 2004, on the SQL Server
programming newsgroup. His goal was to keep football statistics; this is
a simplification ... show about Bell Labs
inventing C++ and OO programming for us, and we got to ask
questions.
One of the questions was how we should put OO stuff into SQL. His
answer was that Bell Labs, w...
Từ khóa: