What represents a double in sql server?

Exactitude with DECIMAL

For specific, high-precision use-cases, we trot out the DECIMAL data type:

-- A decimal so precise, it might as well have a doctorate
DECLARE @zoom_in_on_this DECIMAL(18,5);
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DECIMAL provides the exactnumeric representation you need when precision is the goal. Consider it your go-to datatype for GPS coordinates, financial calculations, or any scenario where approximation just won't fly. However, exercise caution when handling data with companion .NET applications. Differences exist due to distinct binary representation.

Storing GPS Coordinates

Keep these in mind when choosing FLOAT or DECIMAL:

• Accuracy: DECIMAL's fixed precision vs FLOAT's approximation
• Efficiency: FLOAT's faster operations
• Space: FLOAT uses less storage

A snazzy example of coordinate storage:

-- Coordinates are pushing the envelope on precision!
DECLARE @fancy_latitude DECIMAL(9,6);
DECLARE @fancy_longitude DECIMAL(9,6);
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With DECIMAL(9,6) for latitude and longitude, you can accurately place a gnat on a map.

FLOAT(24) vs. FLOAT(53)

Size vs precision, a timeless struggle:

• Space: FLOAT(24) uses less storage
• Precision sacrifice: FLOAT(24) pay less, get less
• Compatibility: Check your ecosystem needs

Rounding for User-Friendliness

Data presentation is as crucial as data accuracy. Prioritize readability and usability by rounding off values. Take for instance presenting latitude/longitude data:

-- "How many decimal places are we using?" "Yes."
SELECT CAST(@Latitude AS DECIMAL(9,5)), CAST(@Longitude AS DECIMAL(9,5));
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This strategy offers a user-friendly data presentation while retaining useful precision.