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...

Ngày tải lên: 26/01/2014, 08:20

... 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...

Ngày tải lên: 26/01/2014, 08:20

... 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...

Ngày tải lên: 26/01/2014, 08:20

... 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...

Ngày tải lên: 26/01/2014, 08:20

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... vsiclab.net v=spf1 ip4:192.168.2.200 Mở dnsmgmt.msc Î Forward Lookup Zone Î phải chuột trên zone name Î New Other record Î Text (TXT) Î Create Record Exchange 2007 Tài liệu dành cho học viên ... : Get-ImapSettings Exchange 2007 Tài liệu dành cho học viên VSIC Education Corporation Trang 86 b. Vào service.msc để start Microsoft Exchange IMAP4 service lên. c. Tạo thê...

Ngày tải lên: 19/01/2014, 19:20

... 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...

Ngày tải lên: 21/01/2014, 08:20