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下面的SQL SELECT查詢返回一個整數:每當我試圖從整數真正把結果的Postgres從包含浮動BYTEA(IEEE 754)真實(個float4)轉換
SELECT (((get_byte(dalsk.data, 0)::bit(8)) ||
(get_byte(dalsk.data, 1)::bit(8)) ||
(get_byte(dalsk.data, 2)::bit(8)) ||
get_byte(dalsk.data, 3)::bit(8)) :: bit(32)) :: integer --AS rezult_float
FROM (SELECT substring(data from 2 for 5) AS data FROM raw_data WHERE
raw_data_id = 33)
AS dalsk;
,我得到的以下錯誤:
Cannot cast type bit to real.
有沒有辦法將值轉換爲float?