当你需要通过指定的文本模式去检查字符串的开头或者结尾的时候，比如文件名后缀，URL Scheme等等。
从上面两个测试来看,like和正则表达使用的操作符是不一样的: ListofoperatorsSchema|Name| Left argtype| Right argtype| Resulttype|Function| Description---+---+---+---+---+---+---pg_catalog | ~~ |text|text|boolean| textlike | matchesLIKEexpression pg_catalog | ~ |text|text|boolean| t...
select calls,total_time/calls as avg_time,left(query,80) from pg_stat_statements order by 2 desc limit 10;sql 调整完后,执行select pg_stat_statements_reset(); 充值pg_stat_statements;的统计信息 SELECT pg_stat_statements_reset(); spcname | spcowner | spcacl | spcoptions ---+---+---...
provides extraction of a substring that matches an SQL regular expression pattern. As with SIMILAR TO, the specified pattern must match to the entire data string, else the function fails and returns null. To indicate the part of the pattern that should be ...
并行取消嵌套可能更容易Acompletely dynamicversion requires dynamic SQL. Use a plpgsql function with...
(the one whose left parenthesis comes first) is returned. You can put parentheses around the whole expression if you want to use parentheses within it without triggering this exception. If you need parentheses in the pattern before the subexpression you want to extract, see the non-capturing ...
在jsonb值中搜索字符串- PostgreSQL如果您使用的是Postgres 12或更高版本，还可以使用JSON路径查询：
postgres 自增需要先进行创建自增序列, 指定自增值, 最小值, 最大值: CREATE SEQUENCE "public"....
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The SQL server is not left out of the picture as the compatible operating systems are Linux, Microsoft Server, and Microsoft Windows. Programming Language Support PostgreSQL There is a large difference between the programming languages that the PostgreSQL server supports and that of the SQL server...