ODBC 드라이버

$url = "http://127.0.0.1:8123/"
$username = "default"
$password = ""
$conn = New-Object System.Data.Odbc.OdbcConnection("`
    Driver={ClickHouse ODBC Driver (Unicode)};`
    Url=$url;`
    Username=$username;`
    Password=$password")
$conn.Open()
$cmd = $conn.CreateCommand()
$cmd.CommandText = "select version()"
$reader = $cmd.ExecuteReader()
$reader.Read()
$reader.GetValue(0)
$reader.Close()
$conn.Close()

Driver={ClickHouse ODBC Driver (Unicode)};Url=http://localhost:8123/;Username=default

Driver={ClickHouse ODBC Driver (Unicode)};Url=https://you-instance-url.gcp.clickhouse.cloud:8443/;Username=default;Password=your-password

SELECT sum(CAST(value, 'Int32'))
FROM values

DB::Exception: Cannot convert NULL value to non-Nullable type: while executing 'FUNCTION CAST(__table1.value :: 2,
'Int32'_String :: 1) -> CAST(__table1.value, 'Int32'_String) Int32 : 0'. (CANNOT_INSERT_NULL_IN_ORDINARY_COLUMN)

SELECT
    sum(value) AS S,
    count() AS C,
    S / C
FROM test

SELECT
    sum(value) AS value,
    avg(value)
FROM test

SELECT
    sum(C1) AS C1,
    count(C1) AS C2
FROM
(
    SELECT sum(value) AS C1
    FROM test
    GROUP BY group_index
) AS TBL

Code: 184. DB::Exception: Received from localhost:9000. DB::Exception: Aggregate function sum(C1) AS C1 is found
inside another aggregate function in query. (ILLEGAL_AGGREGATION)

Code: 164. DB::Exception: Cannot modify 'cast_keep_nullable' setting in readonly mode. (READONLY)
Code: 164. DB::Exception: Cannot modify 'prefer_column_name_to_alias' setting in readonly mode. (READONLY)

ALTER USER your_odbc_user MODIFY SETTING
    readonly = 2

ALTER USER your_odbc_user MODIFY SETTING
    cast_keep_nullable = 1,
    prefer_column_name_to_alias = 1