Get Head First SQL: Your Brain on SQL -- A Learner's Guide PDF

By Lynn Beighley

ISBN-10: 0596526849

ISBN-13: 9780596526849

Is your info dragging you down? Are your tables all knotted up? good we've obtained the instruments to educate you simply how one can wrangle your databases into submission. utilizing the newest learn in neurobiology, cognitive technological know-how, and studying conception to craft a multi-sensory SQL studying event, Head First SQL has a visually wealthy structure designed for how your mind works, now not a text-heavy procedure that places you to sleep.

perhaps you've written a few easy SQL queries to engage with databases. yet now you will have extra, you must fairly dig into these databases and paintings along with your info. Head First SQL will express you the basics of SQL and the way to actually reap the benefits of it. We'll take you on a trip during the language, from uncomplicated INSERT statements and choose queries to hardcore database manipulation with indices, joins, and transactions. we know "Data is Power" - yet we'll allow you to have "Power over your Data". anticipate to have a good time, count on to profit, and count on to be querying, normalizing, and becoming a member of your facts like a professional by the point you're comprehensive reading!

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Additional info for Head First SQL: Your Brain on SQL -- A Learner's Guide

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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.

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