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String concatenation in SQL

2022-08-02 12:32:00 【sleeping bamboo】

The three databases are as follows:

1. sqlserver

select '123'+'456'; --Use + directly for splicing

2, oracle

select '123'||'456' from dual; --Use || for splicing [dual is a virtual table]select concat('123','456') from dual; --Use the concat function for splicing

3. MySQL

select concat('123','456'); --Use the concat function for splicing

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