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Add file() example to clickhouse-local docs

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This commit is contained in:
Alexander Kuzmenkov 2020-07-22 16:38:47 +03:00
parent 72167aa746
commit 8b4de77cf6
1 changed files with 28 additions and 4 deletions
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32
docs/en/operations/utilities/clickhouse-local.md
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@ -23,7 +23,8 @@ For temporary data an unique temporary data directory is created by default. If
Basic usage:
``` bash
$ clickhouse-local --structure "table_structure" --input-format "format_of_incoming_data" -q "query"
$ clickhouse-local --structure "table_structure" --input-format "format_of_incoming_data" \
--query "query"
```
Arguments:
@ -46,7 +47,8 @@ Also there are arguments for each ClickHouse configuration variable which are mo
## Examples {#examples}
``` bash
$ echo -e "1,2\n3,4" | clickhouse-local -S "a Int64, b Int64" -if "CSV" -q "SELECT * FROM table"
$ echo -e "1,2\n3,4" | clickhouse-local --structure "a Int64, b Int64" \
--input-format "CSV" --query "SELECT * FROM table"
Read 2 rows, 32.00 B in 0.000 sec., 5182 rows/sec., 80.97 KiB/sec.
1 2
3 4
@ -55,16 +57,38 @@ Read 2 rows, 32.00 B in 0.000 sec., 5182 rows/sec., 80.97 KiB/sec.
Previous example is the same as:
``` bash
$ echo -e "1,2\n3,4" | clickhouse-local -q "CREATE TABLE table (a Int64, b Int64) ENGINE = File(CSV, stdin); SELECT a, b FROM table; DROP TABLE table"
$ echo -e "1,2\n3,4" | clickhouse-local --query "
CREATE TABLE table (a Int64, b Int64) ENGINE = File(CSV, stdin);
SELECT a, b FROM table;
DROP TABLE table"
Read 2 rows, 32.00 B in 0.000 sec., 4987 rows/sec., 77.93 KiB/sec.
1 2
3 4
```
You don't have to use `stdin` or `--file` argument, and can open any number of
files using the [`file` table function](../../../sql-reference/table-functions/file.md):
``` bash
$ echo 1 | tee 1.tsv
1
$ echo 2 | tee 2.tsv
2
$ clickhouse-local --query "
select * from file('1.tsv', TSV, 'a int') t1
cross join file('2.tsv', TSV, 'b int') t2"
1 2
```
Now let’s output memory user for each Unix user:
``` bash
$ ps aux | tail -n +2 | awk '{ printf("%s\t%s\n", $1, $4) }' | clickhouse-local -S "user String, mem Float64" -q "SELECT user, round(sum(mem), 2) as memTotal FROM table GROUP BY user ORDER BY memTotal DESC FORMAT Pretty"
$ ps aux | tail -n +2 | awk '{ printf("%s\t%s\n", $1, $4) }' \
| clickhouse-local --structure "user String, mem Float64" \
--query "SELECT user, round(sum(mem), 2) as memTotal
FROM table GROUP BY user ORDER BY memTotal DESC FORMAT Pretty"
```
``` text