Rate(nper, pmt, pv[, fv[, type[, guess]]]) 返回一个 Double,指定每一期的年金利率。 nper 必要。Double 指定一笔年金的付款总期数。例如,如果对一笔为期四年的汽车贷款选择按月付款,则贷款共有 4 * 12(或 48)个付款期。 pmt 必要。Double,指定每
Rate(nper, pmt, pv[, fv[, type[, guess]]])
返回一个 Double,指定每一期的年金利率。
nper 必要。Double 指定一笔年金的付款总期数。例如,如果对一笔为期四年的汽车贷款选择按月付款,则贷款共有 4 * 12(或 48)个付款期。
pmt 必要。Double,指定每一期的付款金额。付款金额通常包含本金和利息,且此付款金额在年金的有效期间不变。
pv 必要。Double 指定未来一系列付款或收款的现值。例如,当贷款买一辆汽车时,向贷方所借贷的金额为将来每月偿付给贷方款项的现值。
fv 可选。Variant 指定在付清贷款后所希望的未来值或现金结存。例如,贷款的未来值在贷款付清后为 0 美元。但是,如果想要在 18 年间存下 50,000 美元作为子女教育基金,那么 50,000 美元为未来值。如果省略的话,缺省值为 0。
type 可选。Variant,指定贷款到期时间,如果贷款是在贷款周期结束时到期,则请使用 0。如果贷款是在周期开始时到期,则请使用 1。如果省略的话,缺省值为 0。
guess 可选。Variant 指定 Rate 返回的估算值。如果省略,则 guess 为 0.1 (10%)。
说明:年金是在一段时间内的一系列固定现金支付,年金可以是贷款(如房屋抵押贷款)或是一笔投资(如按月储蓄计划)。 对所有参数,现金支出(如储蓄存款)用负数表示,而现金收入(如红利支票)用正数表示。 Rate 是叠代计算的。先从 guess 的值开始,Rate 反复循环计算,直到精确度达到 0.00001%。如果经过 20 次叠代测试还不能得到结果,则 Rate 计算失败。如果猜测是 10% 而 Rate 计算失败,则请试用不同的 guess.值。

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ToadduserstoMySQLfromthecommandline,loginasroot,thenuseCREATEUSER'username'@'host'IDENTIFIEDBY'password';tocreateanewuser.GrantpermissionswithGRANTALLPRIVILEGESONdatabase.*TO'username'@'host';anduseFLUSHPRIVILEGES;toapplychanges.Alwaysusestrongpasswo

MySQLofferseightstringdatatypes:CHAR,VARCHAR,BINARY,VARBINARY,BLOB,TEXT,ENUM,andSET.1)CHARisfixed-length,idealforconsistentdatalikecountrycodes.2)VARCHARisvariable-length,efficientforvaryingdatalikenames.3)BINARYandVARBINARYstorebinarydata,similartoC


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