語法
TRUNCATE(X,D)
Returns the number X, truncated to D decimal places. If D is 0, the result has no decimal point or fractional part. D can be negative to cause D digits left of the decimal point of the value X to become zero.
返回數字X，截斷到D小數位。 如果D爲0，結果沒有小數點或小數部分。 D是負數，導致值X的小數點左邊的D數字變爲零。
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SELECT truncate(1314.1314, 3); # 1314.131
SELECT truncate(1314.1314, 1); # 1314.1
SELECT truncate(1314.1314, 0); # 1314
SELECT truncate(1314.1314, -1); # 1310
SELECT truncate(1314.1314, -3); # 1000
SELECT truncate(-1314.1314, -1); # -1310
SELECT truncate(-1314.1314, -3); # -1000
SELECT truncate(1314.1314*100, -3); # 131000
1
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原文鏈接：https://blog.csdn.net/csdn_0_001/article/details/79480699