PostgreSQL--常用字符串函数与操作符
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转载：https://blog.csdn.net/weixin_43047710/article/details/82186801?utm_medium=distribute.pc_relevant.none-task-blog-2~default~baidujs_title~default-4.queryctrv4&spm=1001.2101.3001.4242.3&utm_relevant_index=7
