复制mysql> select concat(.,除字 ltrim( ddd ), .); +----------------------------------+ | concat(., ltrim( ddd ), .) | +----------------------------------+ | .ddd . | +----------------------------------+ mysql> select concat(., rtrim( ddd ), .); +----------------------------------+ | concat(., rtrim( ddd ), .) | +----------------------------------+ | . ddd. | +----------------------------------+ mysql> select concat(., trim( ddd ), .); +---------------------------------+ | concat(., trim( ddd ), .) | +---------------------------------+ | .ddd. | +---------------------------------+ 1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.18. |
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