大约有 531 项符合查询结果（耗时：0.0090秒） [XML]
Why use the SQL Server 2008 geography data type?
...dbo.Geo
SELECT geography::Point(12.3456789012345, 12.3456789012345, 4326)
UNION ALL
SELECT geography::Point(87.6543210987654, 87.6543210987654, 4326)
GO 10000
INSERT dbo.LatLng
SELECT 12.3456789012345, 12.3456789012345
UNION
SELECT 87.6543210987654, 87.6543210987654
GO 10000
EXEC sp_spaceuse...
How to report an error from a SQL Server user-defined function
...rom foo where ID = @aID
--error checking code is embedded within this union
--when the ID exists, this second selection is empty due to where clause at end
--when ID doesn't exist, invalid cast with case statement conditionally causes an error
--case statement is very hack-y, but th...
Making heatmap from pandas DataFrame
...sinstance(index, pd.DatetimeIndex):
idx = pd.DatetimeIndex(middle).union([start,end])
elif isinstance(index, (pd.Float64Index,pd.RangeIndex,pd.Int64Index)):
idx = pd.Float64Index(middle).union([start,end])
else:
print('Warning: guessing what to do with index type %s' ...
Detecting endianness programmatically in a C++ program
...punning - it will often be warned against by compiler. That's exactly what unions are for !
bool is_big_endian(void)
{
union {
uint32_t i;
char c[4];
} bint = {0x01020304};
return bint.c[0] == 1;
}
The principle is equivalent to the type case as suggested by others, ...
How do I print a double value with full precision using cout?
...int out the binary bits (or hex nybbles).
One way of doing that is using a union to type-pun the double to a integer and then printing the integer, since integers do not suffer from truncation or round-off issues. (Type punning like this is not supported by the C++ standard, but it is supported in C...
How to get multiple counts with one SQL query?
...
Well, if you must have it all in one query, you could do a union:
SELECT distributor_id, COUNT() FROM ... UNION
SELECT COUNT() AS EXEC_COUNT FROM ... WHERE level = 'exec' UNION
SELECT COUNT(*) AS PERSONAL_COUNT FROM ... WHERE level = 'personal';
Or, if you can do after processing:...
SQL RANK() versus ROW_NUMBER()
...rows are tied when ordered by ID)
WITH T(StyleID, ID)
AS (SELECT 1,1 UNION ALL
SELECT 1,1 UNION ALL
SELECT 1,1 UNION ALL
SELECT 1,2)
SELECT *,
RANK() OVER(PARTITION BY StyleID ORDER BY ID) AS 'RANK',
ROW_NUMBER() OVER(PARTITION BY StyleID ORDER BY...
How do I modify fields inside the new PostgreSQL JSON datatype?
...FROM json_each("json")
WHERE "key" <> "key_to_set"
UNION ALL
SELECT "key_to_set", to_json("value_to_set")) AS "fields"
$function$;
SQLFiddle
Edit:
A version, which sets multiple keys & values:
CREATE OR REPLACE FUNCTION "json_object_set_keys"(
"json" j...
Interface type check with Typescript
...mentioned: since TypeScript 2.0, you can even take the advantage of tagged union type.
interface Foo {
type: 'foo';
fooProperty: string;
}
interface Bar {
type: 'bar';
barProperty: number;
}
let object: Foo | Bar;
// You will see errors if `strictNullChecks` is enabled.
if (objec...
how to exclude null values in array_agg like in string_agg using postgres?
...array[null]:
select
array_agg(x)-array['']
from
( select 'Y' x union all
select null union all
select 'N' union all
select ''
) x;
That's all:
{Y, N}
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