user: Question: How much is the lowest glucose(mmol/L) with [Na +] under 0?
Columns: ['Solution', 'Other Name', '[Na + ](mmol/L)', '[Cl - ](mmol/L)', '[Glucose](mmol/L)', '[Glucose](mg/dl)']
Types: ['text', 'text', 'real', 'real', 'real', 'real']
Sample row: ['D5W', '5% Dextrose', 0.0, 0.0, 278.0, 5000.0]
SQL:

assistant: SELECT MIN("[Glucose](mmol/L)") FROM "Table" WHERE "[Na + ](mmol/L)" < 0.0;