pg 或者Oracle计算字段含有某个字符个数

建立测试表，添加测试数据 1 PG create table pgtest as select ‘mm,lll,kkk’ as testweb 2 oracle create table oracletest as select ‘mm,lll,kkk’ as test from dualoracle 计算元素个数（既逗号个数） select length(translate(test,’,’||

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