Numeric

If/Else in Batch

Master conditional logic in Windows batch files: comparing strings and numbers, testing file existence, checking errorlevel, and chaining else branches.

Intrinsic Functions

The built-in numeric, array, and character functions Fortran provides out of the box, from SQRT and MOD to SUM, MAXVAL, and TRIM.

Data Types in Depth

A practical deep dive into PostgreSQL's rich type system, covering numeric precision, text vs. varchar, JSONB, arrays, and enum/domain types.