SQL VISUAL QUICKSTART GUIDE- P48 doc

... in Microsoft Access and Microsoft SQL Server, change each || to + . In MySQL, use CONCAT() to con- catenate strings. See “Concatenating Strings with || ” in Chapter 5. 459 SQL Tricks Working with Hierarchies Listing ... near-standard) SQL, it’s cumbersome, it’s hard to understand, and it runs slowly because it’s difficult to pick the middle value of an ordered set when SQL is about...

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... or DBMS-specific SQL to import and export SAS data via PROC SQL or SAS/Access. A SAS dataset is equivalent to an SQL table, an observation to an SQL row, and a variable to an SQL column. You can ... Running SQL Programs In this chapter, I’ll describe how to run SQL programs on these DBMSs: ◆ Microsoft Access 2007 ◆ Microsoft SQL Server 2008 ◆ Oracle 11g ◆ IBM DB2 9.5 ◆ MySQL...

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... Blame My Mother P03 ✔ Tips ■ See also “Specifying a Foreign Key with FOREIGN KEY ” in Chapter 11. ■ SQL lets you specify the referential-integrity action that the DBMS takes when you attempt to update

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... the SQL standard. MySQL has ansi mode, for example, and Microsoft SQL Server has SET ANSI_DEFAULTS ON . 65 SQL Basics SQL Standards and Conformance SQL Syntax Figure 3.1 shows an example SQL ... noted, the SQL elements in this book are part of SQL- 92 as well as SQL: 1999 and SQL: 2003. The lowest level of SQL- 92 conformance is called Entry (not Core). Your programs shoul...

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... standard SQL date DATE ‘2006-03-17’ is equivalent to the Access date #2006-03-17# , for example. In Microsoft SQL Server, omit the data type name prefix from datetime literals. The standard SQL ... example. 79 SQL Basics Datetime Types Table 3.15 DBMS Datetime Types DBMS Types Access date/time SQL Server datetime , smalldatetime Oracle date , timestamp DB2 date , time , timest...

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... Attribute Standard SQL IDENTITY Access autonumber , replication id SQL Server uniqueidentifier , identity Oracle rowid , urowid , sequences DB2 Identity columns and sequences MySQL auto_increment attribute PostgreSQL serial , ... searching ◆ Enumerated (enum) values from a specified list 83 SQL Basics Other Data Types User-Defined Types Microsoft SQL Server, Oracle, DB2, and Postg...

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... Microsoft Access has Len() . Microsoft SQL Server has DATALENGTH() . Oracle has LENGTHB() . DB2 has LENGTH() . MySQL has BIT_COUNT() and OCTET_ LENGTH() . PostgreSQL has BIT_LENGTH() and OCTET_LENGTH() . Oracle ... spaces or other characters to strings. The Oracle and PostgreSQL padding functions are LPAD() and RPAD() , for example. Search your DBMS documentation for character functi...

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... CONVERT() in Microsoft SQL Server and MySQL; TO_CHAR() , TO_DATE() , TO_TIMESTAMP() , and TO_NUMBER() in Oracle and PostgreSQL; and TO_CHAR() and TO_DATE() in DB2. Search your DBMS documentation for ... CAST() expression to: CAST(sales AS CHAR(8)) ➝ || ‘ copies sold of ‘ ➝ || SUBSTR(title_name, 1, 20) In MySQL, use SIGNED instead of INTEGER for data_type, and use CONCAT() to concaten...

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... aliases, described in the next sec- tion, are useful in SQL statements that require lengthy qualified names. A fully qualified table name in Microsoft SQL Server, for example, is: server.database.owner.table Oracle ... model requires that comparable columns draw from domains that have the same meaning. Unfortunately, SQL and DBMSs stray from the model and have no intrinsic mechanism tha...

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... a.au_lname, p.pub_name FROM authors a, publishers p WHERE a.city (+) = p.city AND a.city IS NULL; Microsoft Access and MySQL don’t sup- port full outer joins, but you can replicate one by taking the union of left and ... publisher and author are located in the same city. See Figure 7.29 for the result. ✔ Tip ■ In Microsoft SQL Server, you can’t place the * operator on both sides of the com...

Ngày tải lên: 05/07/2014, 05:20