By Jonathan Gennick
ISBN-10: 1449394094
ISBN-13: 9781449394097
If you are a programmer or database administrator who makes use of SQL on your daily paintings, this well known pocket advisor is the appropriate on-the-job reference. you can find many examples that deal with the language's complexity, in addition to key elements of SQL utilized in IBM DB2 free up 9.7, MySQL 5.1, Oracle Database 11g unencumber 2, PostgreSQL 9.0, and Microsoft SQL Server 2008 unencumber 2.
SQL Pocket Guide describes how those database structures enforce SQL syntax for querying, handling transactions, and making adjustments to info. It additionally exhibits how the platforms use SQL services, standard expression syntax, and kind conversion features and formats.
All instance SQL statements during this booklet execute opposed to a suite of tables, with information so you might quick obtain. The 3rd version covers vital database alterations, including:
- Oracle's help of the recursive WITH syntax, and addition of PIVOT and UNPIVOT operators
- Functions new to Oracle, similar to LISTAGG, NTH_VALUE, and extra
- PostgreSQL’s help of recursive WITH and a few window capabilities
- DB2 syntax and datatypes, a few appropriate with Oracle
- MySQL beneficial properties resembling the TIMESTAMP style and the TO_SECONDS functionality
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Additional resources for SQL Pocket Guide
Example text
Years 00–49 are treated as 2000– 2049. You can see this behavior in the preceding example. Be aware that your DBA can change the cutoff value using the two digit year cutoff configuration option. Datetime Conversions: SQL Server | 35 Table 4. mmm a Subtract 100 to get a two-digit year. DATENAME and DATEPART Use the DATENAME and DATEPART functions to extract specific elements from datetime values: 36 | SQL Pocket Guide DATENAME(datepart, datetime) DATEPART(datepart, datetime) DATENAME returns a textual representation, whereas DATEPART returns a numeric representation.
DL Long date format. Output-only. Combines only with TS. Datetime Conversions: Oracle | 29 Element Description DS Short date format. Output-only. Combines only with TS. DY, Dy, or dy Abbreviated name of day. E Abbreviated era name for Japanese Imperial, ROC Official, and Thai Buddha calendars. Input-only. EE Full era name. FF, FF1…FF9 Fractional seconds. Only for TIMESTAMP values. Always use two Fs. FF1…FF9 work in Oracle Database 10g and higher. FM Toggles blank suppression. Output-only. FX Requires exact pattern matching on input.
DATE_ADD(date , INTERVAL value units) Adds value number of units to the date. You can use ADDDATE as a synonym for DATE_ADD. DATE_SUB(date , INTERVAL value units) Subtracts value number of units from the date. You can use SUBDATE as a synonym for DATE_SUB. For example, to add one month to the current date: SELECT DATE_ADD(CURRENT_DATE, INTERVAL 1 MONTH); Or, to subtract one year and two months: SELECT DATE_SUB(CURRENT_DATE, INTERVAL '1-2' YEAR_MONTH); Valid interval keywords for numeric intervals include SECOND, MINUTE, HOUR, DAY, MONTH, and YEAR.
SQL Pocket Guide by Jonathan Gennick
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