Tài liệu SQL Antipatterns- P3 ppt
Tài liệu SQL Antipatterns- P3 ppt
... partitioning
support in MySQL version 5.1, you can specify partitions as an optional
part of a
CREATE TABLE statement.
Download Metadata-Tribbles/soln/horiz-partition .sql
CREATE TABLE Bugs (
bug_id ... data type for real numbers,
c
alled float or double. SQL supports a similar data type of the same
name. Many programmers naturally use the SQL FLOAT data type every-
where they need fracti...
Tài liệu SQL Antipatterns- P4 ppt
... INDEX
Microsoft SQL Server ALTER INDEX REORGANIZE, ALTER INDEX REBUILD,
or DBCC DBREINDEX
MySQL ANALYZE TABLE or OPTIMIZE TABLE
Oracle ALTER INDEX REBUILD
PostgreSQL VACUUM or ANALYZE
SQLite VACUUM
How ... behavior of nul
l
in SQL. Unlike in most programming languages, SQL treats null as a
special value, different from zero, false, or an empty string. This is true
in standard SQL and m...
Tài liệu SQL Antipatterns- P5 ppt
... com-
bine them all into a single pass would be a nightmare.
Writing SQL Automatically—with SQL
When you split up a complex SQL query, the result may be many simi-
l
ar queries, perhaps varying ... writing one SQL statement to solve his complex update, I wrote
a script to generate a set of simpler SQL statements that had the desired
effect:
Download Spaghetti-Query/soln/generate-upda...
Tài liệu SQL Antipatterns- P6 pptx
... See-No-Evil/anti/white-space.php
<?php
$sql = "SELECT
*
FROM Bugs";
if ($bug_id) {
$sql .= "WHERE bug_id = " . intval($bug_id);
}
$stmt = $pdo->prepare( $sql) ;
Why would the query in ... express in SQL are awkward in
A
ctive Record.
Some frameworks try to enhance Active Record to support a
variety of SQL clauses. The more these enhancements expose
the fact t...
Tài liệu Autodesk Inventor P3 ppt
... ->Properties. Nhập các thông tin diễn tả định nghĩa chi tiết nh các
dữ liệu về đề án và chi tiết, các thuộc tính về vật liệu, đơn vị đo, tình trạng chi
tiết Những thông tin trên các Tab Summary, ... nghĩa trớc. Một biểu mẫu có thể chứa các thông tin
về thuộc tính có sẵn nh các thuộc tính về vật liệu, các thông tin về đề án.
Các biểu mẫu đợc lu trữ trong th mục Autodesk\Inventor4\Te...
Tài liệu Databases Demystified- P3 ppt
... to the SQL- 92 (now called SQL2 ) standard. SQL3 includes many of the ob-
ject features required for SQL to operate on an object-relational database, as well as
language extensions to make SQL computationally ... HRPASS;
SQL statements and SQL Plus commands may be entered at the SQL& gt; prompt.
Results display after each command, and the screen scrolls as needed. SQL Plus
comma...
Tài liệu SQL Antipatterns- P1 docx
... limited version
of the SQL language.
He said, “I don’t need to support the full language—that would be too
much work. I need only one SQL statement: SELECT.”
I
hadn’t been taught SQL in school. Databases ... related to data-
base programming. I recommend SQL Performance Tuning [
GP03] and
High Performance MySQL, Second Edition [
SZT
+
08]. Some of the topics
i
n SQL Antipatterns are...