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20 lines
2.0 KiB
TeX
20 lines
2.0 KiB
TeX
\begin{tables}{ll}{Keyword & Description}
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\texttt{SELECT val, val2} & returns the columns \texttt{val} and \texttt{val2} \\
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\texttt{FROM table d, table2 c} & selects the target tables. Can use range variables (\texttt{d, c} here) \\
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\texttt{WHERE} & Filter results. Can also target non-acquired columns \\
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\texttt{DISTINCT} & Returns elements without duplicates \\
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\texttt{IN} & Checks if the element is present in subquery \\
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\texttt{UNION} & Set union (also removes duplicates) \\
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\texttt{INTERSECT} & Set intersection \\
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\texttt{EXCEPT} & Set difference \\
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\texttt{JOIN} & Join tables, always requires a ON clause \\
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\texttt{ON} & Specify on which column with what condition to join the tables \\
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\texttt{DATE} & Used to do comparisons against fixed Dates (followed by Datestring) \\
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\texttt{AS} & Rename a column \\
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\texttt{AVG(column)} & Computes the average of the specified column \\
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\texttt{SUM(column)} & Computes the sum of the specified column \\
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\end{tables}
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We can directly add new columns to our result using statements like (also note that we do not actually return salary and employment columns)
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\mint{sql}{SELECT name, salary * employment / 100 AS RealSalary FROM employees;}
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