d0ad381833
* test: add spark query unit test and check grammar * test: add select explain、lateralSubQuery、transform unit test * chore: fileName exchange --------- Co-authored-by: dilu <dilu@dtstack.com>
39 lines
1.1 KiB
SQL
39 lines
1.1 KiB
SQL
-- UNPIVOT [ { INCLUDE | EXCLUDE } NULLS ] (
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-- { single_value_column_unpivot | multi_value_column_unpivot }
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-- ) [[AS] alias]
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-- single_value_column_unpivot:
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-- values_column
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-- FOR name_column
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-- IN (unpivot_column [[AS] alias] [, ...])
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-- multi_value_column_unpivot:
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-- (values_column [, ...])
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-- FOR name_column
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-- IN ((unpivot_column [, ...]) [[AS] alias] [, ...])
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-- column names are used as unpivot columns
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SELECT * FROM sales_quarterly
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UNPIVOT (
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sales FOR quarter IN (q1, q2, q3, q4)
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);
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-- NULL values are excluded by default, they can be included
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-- unpivot columns can be alias
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-- unpivot result can be referenced via its alias
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SELECT up.* FROM sales_quarterly
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UNPIVOT INCLUDE NULLS (
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sales FOR quarter IN (q1 AS Q1, q2 AS Q2, q3 AS Q3, q4 AS Q4)
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) AS up;
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-- multiple value columns can be unpivoted per row
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SELECT * FROM sales_quarterly
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UNPIVOT EXCLUDE NULLS (
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(first_quarter, second_quarter)
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FOR half_of_the_year IN (
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(q1, q2) AS H1,
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(q3, q4) AS H2
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)
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);
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