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1.oracle 字符串拼接:||
select '1' || '2' from dual;
2.MySQL 字符串拼接:concat(a,b)
select concat('1','2') from dual;
1.oracle 字符串拼接:||
select '1' || '2' from dual;
2.MySQL 字符串拼接:concat(a,b)
select concat('1','2') from dual;