Function: the value of the specified column below which `P` percent of the data points fall.
Return Data Type: the same data type.
Return Data Type: double.
Applicable Data Types: all types except `timestamp`, `binary`, `nchar`, `bool`.
Applied to: table/STable.
Note: The range of `P` is `[0, 100]`. When `P=0` , `PERCENTILE` returns the equal value as `MIN`; when `P=100`, `PERCENTILE` returns the equal value as `MAX`.
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@@ -446,7 +446,7 @@ TDengine supports aggregations over numerical values, they are listed below:
SELECT SPREAD(field_name) FROM { tb_name | stb_name } [WHERE clause]
```
Function: return the difference between the maximum and the mimimum value.
Return Data Type: the same data type.
Return Data Type: double.
Applicable Data Types: all types except `timestamp`, `binary`, `nchar`, `bool`.
Applied to: table/STable.
Note: spread gives the range of data variation in a table/supertable; it is equivalent to `MAX()` - `MIN()`
@@ -103,6 +105,12 @@ class TDengineCursor(object):
defexecute(self,operation,params=None):
"""Prepare and execute a database operation (query or command).
"""
# if threading.get_ident() != self._threadId:
# info ="Cursor execute:Thread ID not match,creater:"+str(self._threadId)+" caller:"+str(threading.get_ident())
# raise OperationalError(info)
# print(info)
# return None
ifnotoperation:
returnNone
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@@ -188,6 +196,11 @@ class TDengineCursor(object):
deffetchall(self):
"""Fetch all (remaining) rows of a query result, returning them as a sequence of sequences (e.g. a list of tuples). Note that the cursor's arraysize attribute can affect the performance of this operation.
"""
# if threading.get_ident() != self._threadId:
# info ="[WARNING] Cursor fetchall:Thread ID not match,creater:"+str(self._threadId)+" caller:"+str(threading.get_ident())
# raise OperationalError(info)
# print(info)
# return None
ifself._resultisNoneorself._fieldsisNone:
raiseOperationalError("Invalid use of fetchall")
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@@ -232,6 +245,12 @@ class TDengineCursor(object):
def_handle_result(self):
"""Handle the return result from query.
"""
# if threading.get_ident() != self._threadId:
# info = "Cursor handleresult:Thread ID not match,creater:"+str(self._threadId)+" caller:"+str(threading.get_ident())