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1 Double data type
"A fundamental data type that holds double-precision floating-point numbers. It's stored as a 64-bit number ranging in value from approximately -1.797E308 to -4.940E-324 (negative), from 4.94E-324 to 1.797E308 (positive), and 0." -
2 Single data type
A data type that stores single-precision floating-point variables as 32-bit (4-byte) floating-point numbers ranging in value from -3.402823E38 to -1.401298E-45 for negative values and 1.401298E-45 to 3.402823E38 for positive values. -
3 float
"A data type that holds floating-point number data from -1.79E + 308 through 1.79E + 308. float, double precision, and float(n) are SQL Server float data types."حُر -
4 real
"An approximate numeric data type with seven-digit precision. It can hold positive values from approximately 1.18E - 38 through 3.40E + 38, negative values from approximately -1.18E - 38 through -3.40E + 38, or zero."
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