SQL中的单记录函数

SQL中的单记录函数SQL中的单记录函数SQL中的单记录函数返回与指定的字符对应的十进制数;SQLselectascii(A)A,ascii(a)a,ascii(0)zero,ascii()spacefromdual;;;;;;AA;;;ZERO;;SPACE;;;;65;;;;;97;;;;;48;;;;;32给出整数,返回对应的字符;SQLselectchr(54740)zhao,chr(65)chr65fromdual;ZHC赵A连接两个字符串;SQLselectconcat(010-,88888888)转23;高乾竞fromdual;高乾23返回字符串并将字符串的第一个字母变为大写;SQLselectinitcap(smith)uppfromdual;UPPSmith5.INSTR(C1,C2,I,J)在一个字符串中搜索指定的字符,返回发现指定的字符的位置;C1;被搜索的字符串C2;希望搜索的字符串I;;搜索的开始位置,默认为1J;;出现的位置,默认为1SQLselectinstr(Oracletraning,ra,1,2)instringfromdual;;INSTRING;;;;;9返回字符串的长度;SQLselectname,length(name),addr,length(addr),sal,length(to_sal))fromgao.nchar_tst;NAMELENGTH(NAME)ADDR;;LENGTH(ADDR);;;;SALLENGTH(TO_CHAR(SAL))高乾竞;3北京市海锭区;;;;;69999.99;7返回字符串,并将所有的字符小写SQLselectlower(AaBbCcDd)AaBbCcDdfromdual;AABBCCDDaabbccdd返回字符串,并将所有的字符大写SQLselectupper(AaBbCcDd)upperfromdual;UPPERAABBCCDD9.RPAD和LPAD(粘贴字符)RPAD;在列的右边粘贴字符LPAD;在列的左边粘贴字符SQLselectlpad(rpad(gao,10,*),17,*)fromdual;LPAD(RPAD(GAO,1*******gao*******不够字符则用*来填满LTRIM;删除左边出现的字符串SQLselectltrim(rtrim(gaoqianjing,),)fromdual;LTRIM(RTRIM(gaoqianjing11.SUBSTR(string,start,count)取子字符串,从start开始,取count个SUBSTR(0888888812.REPLACE(string,s1,s2)string希望被替换的字符或变量s1;;;;被替换的字符串s2;;;;要替换的字符串SQLselectreplace(heloveyou,he,i)fromdual;REPLACE(Hiloveyou返回一个与给定的字符串读音相同的字符串SQLcreatetabletable1(xmvar8));SQLintotable1values(weather);SQLintotable1values(wether);SQLintotable1values(gao);SQLselectxmfromtable1wheresoundex(xm)=soundex(weather);XMweatherwetherSQL中的单记录函数盘点SQL中的单记录函数盘点甲骨文将一直致力于保持Java和整个生态系统的强劲稳定。下面是收集的关于SQL中的单记录函数盘点，希望大家认真阅读!返回与指定的字符对应的十进制数;SQLselectascii(A)A,ascii(a)a,ascii(0)zero,ascii()spacefromdual;AAZEROSPACE------------------------------------65974832给出整数,返回对应的字符;SQLselectchr(54740)zhao,chr(65)chr65fromdual;ZHC---赵A连接两个字符串;SQLselectconcat(010-,88888888)||转23高乾竞fromdual;高乾竞---------------23返回字符串并将字符串的第一个字母变为大写;SQLselectinitcap(smith)uppfromdual;UPP-----Smith5.INSTR(C1,C2,I,J)在一个字符串中搜索指定的字符,返回发现指定的字符的位置;C1被搜索的字符串C2希望搜索的字符串I搜索的开始位置,默认为1J出现的位置,默认为1SQLselectinstr(oracletraning,ra,1,2)instringfromdual;INSTRING---------9返回字符串的长度;SQLselectname,length(name),addr,length(addr),sal,length(to_char(sal))fromgao.nchar_tst;NAMELENGTH(NAME)ADDRLENGTH(ADDR)SALLENGTH(TO_CHAR(SAL))---------------------------------------------------------------------------高乾竞3北京市海锭区69999.997返回字符串,并将所有的`字符小写SQLselectlower(AaBbCcDd)AaBbCcDdfromdual;AABBCCDD--------aabbccdd返回字符串,并将所有的字符大写SQLselectupper(AaBbCcDd)upperfromdual;UPPER--------AABBCCDD9.RPAD和LPAD(粘贴字符)RPAD在列的右边粘贴字符LPAD在列的左边粘贴字符SQLselectlpad(rpad(gao,10,*),17,*)fromdual;LPAD(RPAD(GAO,1*******gao*******不够字符则用*来填满LTRIM删除左边出现的字符串RTRIM删除右边出现的字符串SQLselectltrim(rtrim(gaoqianjing,),)fromdual;LTRIM(RTRIM(gaoqianjing11.SUBSTR(string,start,count)取子字符串,从start开始,取count个SUBSTR(0888888812.REPLACE(string,s1,s2)string希望被替换的字符或变量s1被替换的字符串s2要替换的字符串SQLselectreplace(heloveyou,he,i)fromdual;REPLACE(Hiloveyou返回一个与给定的字符串读音相同的字符串SQLcreatetabletable1(xmvarchar(8));SQLinsertintotable1values(weather);SQLinsertintotable1values(wether);SQLinsertintotable1values(gao);SQLselectxmfromtable1wheresoundex(xm)=soundex(weather);XMweatherwether14.TRIM(sfromstring)LEADING剪掉前面的字符TRAILING剪掉后面的字符如果不指定,默认为空格符返回指定值的绝对值SQLselectabs(100),abs(-100)fromdual;ABS(100)ABS(-100)100100给出反余弦的值SQLselectacos(-1)fromdual;ACOS(-1)给出反正弦的值SQLselectasin(0.5)fromdual;ASIN(0.5).52359878返回一个数字的反正切值SQLselectatan(1)fromdual;ATAN(1).78539816返回大于或等于给出数字的最小整数SQLselectceil(3.1415927)fromdual;CEIL(3.1415927)4返回一个给定数字的余弦SQLselectcos(-3.1415927)fromdual;COS(-3.1415927)-1返回一个数字反余弦值SQLselectcosh(20)fromdual;COSH(20)242582598返回一个数字e的n次方根SQLselectexp(2),exp(1)fromdual;EXP(2)EXP(1)对给定的数字取整数SQLselectfloor(2345.67)fromdual;FLOOR(2345.67)2345返回一个数字的对数值SQLselectln(1),ln(2),ln(2.7182818)fromdual;LN(1)LN(2)LN(2.7182818)0.69314718.9999999925.LOG(n1,n2)返回一个以n1为底n2的对数SQLselectlog(2,1),log(2,4)fromdual;LOG(2,1)LOG(2,4)0226.MOD(n1,n2)返回一个n1除以n2的余数SQLselectmod(10,3),mod(3,3),mod(2,3)fromdual;MOD(10,3)MOD(3,3)MOD(2,3)102返回n1的n2次方根SQLselectpower(2,10),power(3,3)fromdual;POWER(2,10)POWER(3,3)102427按照指定的精度进行舍入SQLselectround(55.5),round(-55.4),trunc(55.5),trunc(-55.5)fromdual;ROUND(55.5)ROUND(-55.4)TRUNC(55.5)TRUNC(-55.5)56-5555-55取数字n的符号,大于0返回1,小于0返回-1,等于0返回0SQLselectsign(123),sign(-100),sign(0)fromdual;SIGN(123)SIGN(-100)SIGN(0)1-10返回一个数字的正弦值SQLselectsin(1.57079)fromdual;SIN(1.57079)1返回双曲正弦的值SQLselectsin(20),sinh(20)fromdual;SIN(20)SINH(20).91294525242582598返回数字n的根SQLselectsqrt(64),sqrt(10)fromdual;SQRT(64)SQRT(10)返回数字的正切值SQLselecttan(20),tan(10)fromdual;TAN(20)TAN(10)2.2371609.64836083返回数字n的双曲正切值SQLselecttanh(20),tan(20)fromdual;TANH(20)TAN(20)按照指定的精度截取一个数SQLselecttrunc(124.1666,-2)trunc1,trunc(124.16666,2)fromdual;TRUNC1TRUNC(124.16666,2)增加或减去月份SQLselectto_char(add_months(to_date(199912,yyyymm),2),yyyymm)fromdual;TO_CHA200002SQLselectto_char(add_months(to_date(199912,yyyymm),-2),yyyymm)fromdual;TO_CHA199910返回日期的最后一天SQLselectto_char(sysdate,yyyy.mm.dd),to_char((sysdate)+1,yyyy.mm.dd)fromdual;TO_CHAR(SYTO_CHAR((SSQLselectlast_day(sysdate)fromdual;LAST_DAY(S31-5月-0438.MONTHS_BETWEEN(date2,date1)给出date2-date1的月份SQLselectmonths_between(19-12月-1999,19-3月-1999)mon_betweenfromdual;MON_BETWEEN9SQLselectmonths_between(to_date(2000.05.20,yyyy.mm.dd),to_date(2005.05.20,yyyy.mm.dd))mon_betwfromdual;MON_BETW-6039.NEW_TIME(date,this,that)给出在this时区=other时区的日期和时间SQLselectto_char(sysdate,yyyy.mm.ddhh24:mi:ss)bj_time,to_char(new_time2(sysdate,PDT,GMT),yyyy.mm.ddhh24:mi:ss)los_anglesfromdual;BJ_TIMELOS_ANGLES2004.05.0911:05:322004.05.0918:05:3240.NEXT_DAY(date,day)给出日期date和星期x之后计算下一个星期的日期SQLselectnext_day(18-5月-2001,星期五)next_dayfromdual;NEXT_DAY25-5月-01用来得到系统的当前日期SQLselectto_char(sysdate,dd-mm-yyyyday)fromdual;TO_CHAR(SYSDATE,09-05-2004星期日trunc(date,fmt)按照给出的要求将日期截断,如果fmt=mi表示保留分,截断秒SQLselectto_char(trunc(sysdate,hh),yyyy.mm.ddhh24:mi:ss)hh,2to_char(trunc(sysdate,mi),yyyy.mm.ddhh24:mi:ss)hhmmfromdual;HHHHMM2004.05.0911:00:002004.05.0911:17:00将字符数据类型转换为ROWID类型SQLselectrowid,rowidto