I am trying to find a way to split my array when the next element is smaller than the previous element. Here is some sample data [100, 200, 500, 100, 150, 200] I need to convert this to [[100, 200, 500],[100, 150, 200]] I am trying to calculate the running difference of the array and I need to handle the
Tag: clickhouse
Is there a way to calculate difference whthin a specific time range using clickhouse MV?
For example, this is my source table What I want to do is to create a MV which asynchronously calculate the price difference whthin 30 min. And then, I can get the difference from this MV using an id every time. Here is an SQL example. It works correctly while directly execute it, but does not work while creating a
Nearest matching text search using the same table in ClickHouse
Insert Data I want get the nearest matching text for each path field using the same table I read this example, but in this case “clickhouse” isn’t a value of the same table… Answer You do understand that it’s a cross join and in case of 10 rows, it’s 100 ngramDistance calls ?
How to classify rows having one or more related records
I need to add the additional column called rank_2 which will show whether the source has more than 1 source_ids. So, I need to get this result: I don’t know how to write a query to get rank_2, which will contain 1 when the source has the only source_id (like the source “b”) and contain 2 when the source has
I am getting this error on inserting data in ClickHouse
Unknown error field: Code: 27. DB::ParsingException: Cannot parse input: expected ‘”‘ before: ’40”,”gmtoffset”:0,”open”:109.6,”high”:109.6,”low”:109.6,”close”:109.6,”volume”:0,”previousClose”:108.4,”change”:1.2,”change_p”:1.107}n’: (while reading the value of key timestamp): While executing JSONEachRowRowInputFormat: (at row 1). (CANNOT_PARSE_INPUT_ASSERTION_FAILED) (version 21.11.5.33 (official build))] Create table query is simple insert query: Answer The type of column ‘previousClose’ is ‘Int32’, but the value in realTime is the float type. I tried your problem with
How to select data with percentages from Clickhouse?
Given the following table: I’m trying to fetch all statuses by host, with their relative percentage. In order to do that, I need to count results grouped by host and status, and divide each counted field by its total host fields count. For example, this query would have worked in MySQL: But ClickHouse throws: DB::Exception: Unknown identifier: host_total; there are
Clickhouse; Issues listing ip addresses where the column has multiple ip addresses
I am trying to get a list of all of our users’ IPv4 addresses in a Clickhouse Table. Since some of our users have multiple IPv4 addresses separated by a comma, I created this query: but it gives me this error: Nested type Array(String) cannot be inside Nullable type. is it possible to only select a portion of the string
How to parse a Clickhouse-SQL statement using ANTRL4?
Objective : Add an additional WHERE clause to any given Clickhouse statement. I’m using the following Antlr grammars to generate Java classes for a lexer & parser. Lexer grammar https://github.com/ClickHouse/ClickHouse/blob/master/utils/antlr/ClickHouseLexer.g4 Parser grammar https://github.com/ClickHouse/ClickHouse/blob/master/utils/antlr/ClickHouseParser.g4 Problem : I cannot figure out/understand how to interact or create the appropriate POJOs for use with the generated classes that Antlr produces. Example of statement Goal
Clickhouse: Mapping BETWEEN filtering from an array
I understand if I want to filter a column between two numbers I can use BETWEEN: Is there a way of mapping the filtering to an array of values, for instance, if the array was [1, 10, … , N]: Answer Try this query:
Analysis of the completeness of the availability of products from the ClickHouse SQL database
Documentation: https://clickhouse.tech/docs/en/ Goal: 85% of the brand’s product range should be available for purchase Calculate the number of products of each brand by availability (maxItems > 0)…