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* update presentations * CLICKHOUSE-2936: redirect from clickhouse.yandex.ru and clickhouse.yandex.com * update submodule * lost files * CLICKHOUSE-2981: prefer sphinx docs over original reference * CLICKHOUSE-2981: docs styles more similar to main website + add flags to switch language links * update presentations * Less confusing directory structure (docs -> doc/reference/) * Minify sphinx docs too * Website release script: fail fast + pass docker hash on deploy * Do not underline links in docs * shorter * cleanup docker images * tune nginx config * CLICKHOUSE-3043: get rid of habrastorage links * Lost translation * CLICKHOUSE-2936: temporary client-side redirect * behaves weird in test * put redirect back * CLICKHOUSE-3047: copy docs txts to public too * move to proper file * remove old pages to avoid confusion * Remove reference redirect warning for now * Refresh README.md * Yellow buttons in docs * Use svg flags instead of unicode ones in docs * fix test website instance * Put flags to separate files * wrong flag * Copy Yandex.Metrica introduction from main page to docs * Yet another home page structure change, couple new blocks (CLICKHOUSE-3045) * Update Contacts section * CLICKHOUSE-2849: more detailed legal information * CLICKHOUSE-2978 preparation - split by files * More changes in Contacts block * Tune texts on index page * update presentations * One more benchmark * Add usage sections to index page, adapted from slides * Get the roadmap started, based on slides from last ClickHouse Meetup * CLICKHOUSE-2977: some rendering tuning * Get rid of excessive section in the end of getting started * Make headers linkable * CLICKHOUSE-2981: links to editing reference - https://github.com/yandex/ClickHouse/issues/849 * CLICKHOUSE-2981: fix mobile styles in docs * Ban crawling of duplicating docs * Open some external links in new tab * Ban old docs too * Lots of trivial fixes in english docs * Lots of trivial fixes in russian docs * Remove getting started copies in markdown * Add Yandex.Webmaster * Fix some sphinx warnings * More warnings fixed in english docs * More sphinx warnings fixed * Add code-block:: text * More code-block:: text * These headers look not that well * Better switch between documentation languages * merge use_case.rst into ya_metrika_task.rst * Edit the agg_functions.rst texts * Add lost empty lines * Lost blank lines * Add new logo sizes * update presentations * Next step in migrating to new documentation * Fix all warnings in en reference * Fix all warnings in ru reference * Re-arrange existing reference * Move operation tips to main reference * Fix typos noticed by milovidov@ * Get rid of zookeeper.md * Looks like duplicate of tutorial.html * Fix some mess with html tags in tutorial * No idea why nobody noticed this before, but it was completely not clear whet to get the data * Match code block styling between main and tutorial pages (in favor of the latter) * Get rid of some copypaste in tutorial * Normalize header styles * Move example_datasets to sphinx * Move presentations submodule to website * Move and update README.md * No point in duplicating articles from habrahabr here * Move development-related docs as is for now * doc/reference/ -> docs/ (to match the URL on website) * Adapt links to match the previous commit * Adapt development docs to rst (still lacks translation and strikethrough support) * clean on release * blacklist presentations in gulp * strikethrough support in sphinx * just copy development folder for now * fix weird introduction in style article * Style guide translation (WIP) * Finish style guide translation to English * gulp clean separately * Update year in LICENSE * Initial CONTRIBUTING.md * Fix remaining links to old docs in tutorial * Some tutorial fixes * Typo * Another typo * Update list of authors from yandex-team accoding to git log
139 lines
2.9 KiB
ReStructuredText
139 lines
2.9 KiB
ReStructuredText
Operators
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=========
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All operators are transformed to the corresponding functions at the query parsing stage, in accordance with their precedence and associativity.
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Access operators
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----------------
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``a[N]`` - Access to an array element, arrayElement(a, N) function.
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``a.N`` - Access to a tuple element, tupleElement(a, N) function.
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Numeric negation operator
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-------------------------
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``-a`` - negate(a) function
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Multiplication and division operators
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-------------------------------------
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``a * b`` - multiply(a, b) function
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``a / b`` - divide(a, b) function
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``a % b`` - modulo(a, b) function
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Addition and subtraction operators
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----------------------------------
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``a + b`` - plus(a, b) function
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``a - b`` - minus(a, b) function
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Comparison operators
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--------------------
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``a = b`` - equals(a, b) function
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``a == b`` - equals(a, b) function
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``a != b`` - notEquals(a, b) function
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``a <> b`` - notEquals(a, b) function
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``a <= b`` - lessOrEquals(a, b) function
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``a >= b`` - greaterOrEquals(a, b) function
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``a < b`` - less(a, b) function
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``a > b`` - greater(a, b) function
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``a LIKE s`` - like(a, b) function
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``a NOT LIKE s`` - notLike(a, b) function
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``a BETWEEN b AND c`` - equivalent to a >= b AND a <= c
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Operators for working with data sets
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------------------------------------
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*See the section "IN operators".*
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``a IN ...`` - in(a, b) function
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``a NOT IN ...`` - notIn(a, b) function
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``a GLOBAL IN ...`` - globalIn(a, b) function
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``a GLOBAL NOT IN ...`` - globalNotIn(a, b) function
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Logical negation operator
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-------------------------
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``NOT a`` - ``not(a)`` function
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Logical "AND" operator
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----------------------
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``a AND b`` - function ``and(a, b)``
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Logical "OR" operator
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---------------------
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``a OR b`` - function ``or(a, b)``
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Conditional operator
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--------------------
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``a ? b : c`` - function ``if(a, b, c)``
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Conditional expression
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----------------------
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.. code-block:: sql
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CASE [x]
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WHEN a THEN b
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[WHEN ... THEN ...]
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ELSE c
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END
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If x is given - transform(x, [a, ...], [b, ...], c). Otherwise, multiIf(a, b, ..., c).
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String concatenation operator
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-----------------------------
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``s1 || s2`` - concat(s1, s2) function
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Lambda creation operator
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------------------------
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``x -> expr`` - lambda(x, expr) function
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The following operators do not have a priority, since they are brackets:
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Array creation operator
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-----------------------
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``[x1, ...]`` - array(x1, ...) function
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Tuple creation operator
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-----------------------
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``(x1, x2, ...)`` - tuple(x2, x2, ...) function
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Associativity
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-------------
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All binary operators have left associativity. For example, ``'1 + 2 + 3'`` is transformed to ``'plus(plus(1, 2), 3)'``.
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Sometimes this doesn't work the way you expect. For example, ``'SELECT 4 > 3 > 2'`` results in ``0``.
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For efficiency, the 'and' and 'or' functions accept any number of arguments. The corresponding chains of AND and OR operators are transformed to a single call of these functions.
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