postgresql create table if not exists 文心快码BaiduComate 在PostgreSQL 中,可以使用 CREATE TABLE IF NOT EXISTS 语句来创建表,如果该表尚不存在的话。以下是对你的问题的详细回答: 语法或命令: PostgreSQL 支持 CREATE TABLE IF NOT EXISTS 语法,这个命令用于检查一个表是否已经存在,如果不存在,则创建该表。
constraints:Optional column constraints, such as PRIMARY KEY, NOT NULL, etc. Example: Using CREATE TABLE IF NOT EXISTS Let’s say we want to create a table called employees with three columns: id, name, and department. Code: -- Create employees table only if it does not already exist CRE...
strSQL :='CREATE TABLE IF NOT EXISTS'||TG_RELNAME||'_'||curMM||'( CHECK('||time_column_name||'>='''|| startTime ||'''AND'||time_column_name||'<'''|| endTime ||''')) INHERITS ('||TG_RELNAME||') ;';EXECUTE strSQL;--创建索引 strSQL :='CREATE INDEX'||TG_RELNAME|...
IF ( isExist = false ) THEN -- 创建子分区表 startTime := curMM||'01 00:00:00.000'; endTime := to_char( startTime::timestamp + interval '1 month', 'YYYY-MM-DD HH24:MI:'); strSQL := 'CREATE TABLE IF NOT EXISTS '||TG_RELNAME||'_'||curMM|| ' ( CHECK('||time_column...
CREATE OR REPLACE FUNCTION myCreateTable(myIdent text) RETURNS void AS $$ BEGIN EXECUTE format( ' CREATE TABLE IF NOT EXISTS %I ( the_id int PRIMARY KEY, name text ); ', myIdent ); END; $$ LANGUAGE plpgsql VOLATILE; [ IF NOT EXISTS ] has been in PostgreSQL since 9.1 Share Improv...
CREATE TABLE IF NOT EXISTS author_information AS SELECT * FROM author_details; Postgres generates a notice instead of throwing an error. It proves the working of the “IF NOT EXISTS” option. Conclusion In PostgreSQL, a new table can be created via theSELECTcommand; for this purpose, theCREAT...
CREATE TABLE [IF NOT EXISTS] table_name ( column1 datatype(length) column_constraint, column2 datatype(length) column_constraint, ... table_constraints ); In this syntax: First, specify the name of the table that you want to create after the CREATE TABLE keywords. The table name must be...
) showuseage exit 1 ;; esac done BAKUP_SQL=" create table if not exists pg_log_:bak_log_span as select :today::varchar(8) as bak_date ,* from pg_log where 1 = 2 ; delete from pg_log_:bak_log_span where to_char(log_time,'yyyymmdd')::numeric = ${BAKUP_DATE} ; insert ...
postgres=# \help create table Command: CREATE TABLE Description: define a new table Syntax: CREATE [ [ GLOBAL | LOCAL ] { TEMPORARY | TEMP } | UNLOGGED ] TABLE [ IF NOT EXISTS ] table_name ( [ { column_name data_type [ STORAGE { PLAIN | EXTERNAL | EXTENDED | MAIN | DEFAULT } ...
-- 创建触发器函数(新增数据时,插入到指定分表中,若分表不存在则创建)CREATEORREPLACEFUNCTIONauto_insert_sub_indicator_table()RETURNStriggerAS$BODY$DECLAREtime_column_nametext;-- 父表中用于分区的时间字段的名称(推送时间)curMMvarchar(6);-- 'YYYYMM'字串,用做分区子表的后缀isExistboolean;-- 分区子表...