Difference between pages "SELECT basics" and "+(dates)/de"

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(→‎Introducing the BBC Table of Countries)
 
 
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==Introducing the BBC Table of Countries==
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[[Category:Deutsch]]
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This tutorial introduces SQL as a  query language. We will be using the SELECT command on the table bbc:
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<table align='right' border='1'>
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<table style='' border='1'><tr>
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<caption>Kompatibilität</caption>
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<th>name</th>
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<tr><th colspan='3'>d + i</th></tr>
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<th>region</th>
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<tr><td align='center'>'''DBMS'''</td><td align='center'>'''OK'''</td><td align='center'>'''Alternative'''</td></tr>
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<th>area</th>
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<tr><td align='left'>Ingres</td><td>Nein</td><td>whn + date('7 day')</td></tr>
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<th>population</th>
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<tr><td align='left'>MySQL</td><td>Ja</td><td></td></tr>
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<th>gdp</th>
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<tr><td align='left'>Oracle</td><td>Ja</td><td></td></tr>
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</tr>
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<tr><td align='left'>PostgreSQL</td><td>Nein</td><td>[[%2B_INTERVAL/de |d+ INTERVAL 'i DAY']]</td></tr>
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<tr>
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<tr><td align='left'>SQL Server</td><td>Ja</td><td></td></tr>
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<td>Afghanistan</td>
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<td>South Asia</td>
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<td align='right'>652225</td>
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<td align='right'>26000000</td>
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<td></td>
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</tr>
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<tr>
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<td>Albania</td>
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<td>Europe</td>
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<td align='right'>28728</td>
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<td align='right'>3200000</td>
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<td align='right'>6656000000</td>
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</tr>
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<tr>
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<td>Algeria</td>
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<td>Middle East</td>
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<td align='right'>2400000</td>
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<td align='right'>32900000</td>
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<td align='right'>75012000000</td>
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</tr>
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<tr>
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<td>Andorra</td>
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<td>Europe</td>
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<td align='right'>468</td>
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<td align='right'>64000</td>
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<td></td>
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</tr>
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<tr>
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<td colspan='5'>...</td>
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</tr>
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</table>
 
</table>
  
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<div class='qu'>
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<h1>+ (dates)</h1>
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The example shows the population of 'France'.
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<p>d + i liefert ein Datum, das i Tage nach dem Datum d liegt.</p>
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Strings should be in 'single quotes';
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<pre style='width:80ex'>
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DATE '2006-05-20' + 7  -> DATE '2006-05-27'
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<p class='imper'>Show the population of Germany</p>
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</pre>
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<div class=params>schema:gisq</div>
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<source lang='sql' class='def'>
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<div class='ht'>
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SELECT population FROM bbc
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Im Beispiel wird ein Datum 7 Tage nach dem Datumswert in <code>whn</code> ermittelt.
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   WHERE name = 'France'
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<source lang='sql' class='def e-ingres'>
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SELECT whn, whn + DATE('7 day')
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   FROM eclipse
 
</source>
 
</source>
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<source lang='sql' class='def e-postgres'>
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<source lang='sql' class='ans'>
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SELECT whn, whn+INTERVAL 7 DAY
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SELECT population FROM bbc
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   FROM eclipse
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   WHERE name = 'Germany'
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</source>
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<source lang='sql' class='def e-oracle'>
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SELECT whn, whn+7
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  FROM gisq.eclipse
 
</source>
 
</source>
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</div>
 
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<div class='qu'>
 
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<div>This query shows the population density <code>population/area</code>
 
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for each country where the area is over 5,000,000 km<sup>2</sup>.</div>
 
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<div class='imper'>Show the per capita gdp: <code>gdp/population</code>
 
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for each country where the area is over 5,000,000 km<sup>2</sup></div>
 
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<source lang='sql' class='def'>
 
<source lang='sql' class='def'>
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SELECT name, population/area FROM bbc
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SELECT whn, whn+7
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   WHERE area > 5000000
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   FROM eclipse
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</source>
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<source lang='sql' class='ans'>
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SELECT name, gdp/population FROM bbc
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  WHERE area > 5000000
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</source>
 
</source>
 
</div>
 
</div>
  
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<div class='qu'>
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<p>Siehe auch</p>
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Where to find some very small, very rich countries.<br/>
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<ul>
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  <b>We use <code>AND</code> to ensure that two or more conditions hold
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   <li>[[EXTRACT/de | Funktion EXTRACT]]</li>
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   true.</b>
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   <li>[[%2B_INTERVAL/de |Funktion + INTERVAL]]</li>
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  <div>The example shows the countries where the population is small and the
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</ul>
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  gdp is high.</div>
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   <div class='imper'>Show the <b>name</b> and <b>region</b> where the area is less then 2000 and the gdp is more than 5000000000</div>
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<source lang='sql' class='def'>
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SELECT name , region
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  FROM bbc
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  WHERE population < 2000000
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    AND gdp > 5000000000
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</source>
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<source lang='sql' class='ans'>
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{{Languages}}
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SELECT name , region
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  FROM bbc
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  WHERE area < 2000
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    AND gdp > 5000000000
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</source>
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</div>
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Latest revision as of 17:18, 21 October 2012

Kompatibilität
d + i
DBMSOKAlternative
IngresNeinwhn + date('7 day')
MySQLJa
OracleJa
PostgreSQLNeind+ INTERVAL 'i DAY'
SQL ServerJa

+ (dates)

d + i liefert ein Datum, das i Tage nach dem Datum d liegt.

 DATE '2006-05-20' + 7  -> DATE '2006-05-27'
schema:gisq

Im Beispiel wird ein Datum 7 Tage nach dem Datumswert in whn ermittelt. 

SELECT whn, whn + DATE('7 day')
  FROM eclipse
SELECT whn, whn+INTERVAL 7 DAY
  FROM eclipse
SELECT whn, whn+7 
  FROM gisq.eclipse
SELECT whn, whn+7 
  FROM eclipse

Siehe auch

Sprache: English  • Deutsch
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