例子:repeat('Pg', 4) = PgPgPgPg 函数:replace(string text, from text, to text) 说明:Replace all occurrences in string of substring from with substring to 将字符的某一子串替换成另一子串 例子:('abcdefabcdef', 'cd', 'XX') = abXXef
/*ORACLE中的支持正则表达式的函数主要有下面四个:1,REGEXP_LIKE :与LIKE的功能相似2,REGEXP_INSTR :与INSTR的功能相似3,REGEXP_SUBSTR :与SUBSTR的功能相似4,REGEXP_REPLACE :与REPLACE的功能相似它们在用法上与Oracle SQL 函数LIKE.INSTR.SUBSTR 和REPLACE 用法相同,但是它们使用POSIX 正则表达式代替了老的百分号...
例子:repeat('Pg', 4) = PgPgPgPg 函数:replace(string text, from text, to text) 说明:Replace all occurrences in string of substring from with substring to 将字符的某一子串替换成另一子串 例子:('abcdefabcdef', 'cd', 'XX') = abXXefabXXef 函数:rpad(string text, length int [, fill t...
CREATE OR REPLACE FUNCTION count_em_all (limitNum INTEGER) RETURNS SETOF table_count AS ' DECLARE the_count RECORD; -- 当前行数 t_name RECORD; -- 当前表名 r table_count%ROWTYPE; BEGIN -- 循环所有表,对于每个表进行相关操作。 FOR t_name IN select concat_ws(''.'',''"''||pn.nsp...
CREATE [ OR REPLACE ] RULE name AS ON event TO table [ WHERE condition ] DO [ ALSO | INSTEAD ] { NOTHING | command | ( command ; command ... ) }CREATE SCHEMA定义一个新模式。CREATE SCHEMA schema_name [ AUTHORIZATION username ] [ schema_element [ ... ] ] CREATE SCHEMA AUTHORIZATION...
CREATE OR REPLACE FUNCTION "public"."pglogical_relhaspkey_repset"() RETURNS "pg_catalog"."void" AS $BODY$ DECLARE obj record; BEGIN FOR obj IN (SELECT n.nspname, c.relname, c.relhaspkey FROM pg_catalog.pg_class c LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace ...
postgres ALL=(ALL) NOPASSWD: ALL 1. 进入官网找到链接,这里使用源码安装。 wget https:///pub/source/v16.1/postgresql-16.1.tar.gz 1. 解压并进入解压目录 mv postgresql-16.1.tar.gz /home/postgres su - postgres tar -zxf postgresql-16.1.tar.gz ...
replace(string text, from text, to text) text 把字串string里出现地所有子字串from替换成子字串to。 replace('abcdefabcdef', 'cd', 'XX') abXXefabXXef rpad(string text, length int [, fill text]) text 通过填充字符fill(默认为空白),把string填充为长度length。如果string已经比length长则将其截...
CREATEORREPLACEFUNCTIONcount_em_all (limitNumINTEGER) RETURNS SETOF table_count AS ' DECLARE the_countRECORD;-- 当前行数t_nameRECORD;-- 当前表名r table_count%ROWTYPE;BEGIN-- 循环所有表,对于每个表进行相关操作。FORt_nameINselectconcat_ws(''.'',''"''||pn.nspname||''"'',''"''||pc...
replace(query, chr(10), ' ') as query from (select pgsa.datname as datname, pgsa.usename as usename, pgsa.client_addr client_addr, pgsa.application_name as application_name, pgsa.state as state, pgsa.backend_start as backend_start, pgsa.xact_start as xact_start, extract(epoch from ...