在这种情况下,如果不存在,则很容易使用create index concurrently if not exists。 然而,问题是create index concurrently不是原子的:如果一次尝试部署失败,那么索引将仍被定义了,处于无效状态。这是一个简单的例子: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 ...
CREATE[UNIQUE]INDEX[CONCURRENTLY][[IFNOTEXISTS]name]ON[ONLY]table_name[USINGmethod]({column_name|(expression)}[COLLATEcollation][opclass[(opclass_parameter=value[,...])]][ASC|DESC][NULLS{FIRST|LAST}][,...])[INCLUDE(column_name[,...])][WITH(storage_parameter[=value][,...])][TABLESP...
Here’s the basic syntax of theCREATE INDEXstatement: CREATEINDEX[IFNOTEXISTS]index_nameONtable_name(column1,column2,...); In this syntax: First, specify the index name after theCREATE INDEXclause. Second, use theIF NOT EXISTSoption to prevent an error if the index already exists. Third,...
4.创建索引 --建普通索引(索引名通常为 idx_表名_字段名)CREATEINDEXIFNOTEXISTSidx_my_table_ageONmy_table USING btree (age);--建唯一索引CREATEUNIQUEINDEXCONCURRENTLYIFNOTEXISTSidx_unique_my_table_idONmy_table (id);--组合索引CREATEINDEXIFNOTEXISTSindex_nameONtable_name (column1_name, column2_nam...
drop indexifexists"t_user_pkey";alter table"t_user"add constraint"t_user_pkey"primarykey("ID"); 根据已有表结构创建表 代码语言:javascript 复制 create tableifnot exists新表(like 旧表 including indexes including comments including defaults); ...
drop index if exists "t_user_pkey"; alter table "t_user" add constraint "t_user_pkey" primary key ("ID"); 根据已有表结构创建表 create table if not exists 新表 (like 旧表 including indexes including comments including defaults);
idxsuffixint:=1;sqltext:='create index IF NOT EXISTS i'||idxprefix||'_%s on '||quote_ident(v_nsp)||'.'||quote_ident(v_tbl)||' using %s (%I %s) tablespace '||quote_ident(v_tbs)||' ;';beginforv_attname,v_typidinselectattname,atttypidfrompg_attributewherenotattisdroppedand...
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 } ...
createeventtriggerbonddl_command_startwhenTAGIN('CREATE TABLE','DROP TABLE')executeprocedureabort1(); 使用对应的用户test1登录实例后创建表,测试能否创建。 DDL语句被成功阻止。 DDL增量订阅同步 CREATESCHEMA IFNOTEXISTSdts_audit;CREATETABLEIFNOTEXISTSdts_audit.dts_tb_ddl_command ( event text, ...
安装扩展:CREATE EXTENSION if not exists extension_name; 管理已安装扩展:SELECT * FROM pg_extension; 常用插件介绍: PostGIS:支持地理信息系统(GIS)数据的扩展。 pgcrypto:提供加密功能的扩展。 故障排查 常见问题解决方案: 使用pg_stat_activity查看活动连接和查询。