ADD [ COLUMN ] column_type [ column_constraint [ ... ] ] DROP [ COLUMN ] column [ RESTRICT | CASCADE ] ALTER [ COLUMN ] column TYPE type [ USING expression ] ALTER [ COLUMN ] column SET DEFAULT expression ALTER [ COLUMN ] column DROP DEFAULT ALTER [ COLUMN ] column { SET | DROP...
--if-exists 当删除对象时使用IF EXISTS --inserts 以INSERT命令,而不是COPY命令的形式转储数据,使用该选项可以把数据加载到非pg数据库,会使恢复非常慢 该选项为每行生成1个单独的insert命令,?在恢复过程中遇到错误,将会丢失1行而不是全部表数据 --column-inserts 以带有列名的INSERT命令形式转储数据,例如insert ...
] ) [ USING INDEX TABLESPACE tablespace ] | PRIMARY KEY ( column_name [, ... ] ) [ USING INDEX TABLESPACE tablespace ] | CHECK ( expression ) | FOREIGN KEY ( column_name [, ... ] ) REFERENCES ref_table [ ( ref_column [, ... ] ) ] [ MATCH FULL | MATCH PARTIAL | MATCH ...
{ "lock_file_exists", ERRCODE_LOCK_FILE_EXISTS }, { "fdw_error", ERRCODE_FDW_ERROR }, { "fdw_column_name_not_found", ERRCODE_FDW_COLUMN_NAME_NOT_FOUND }, { "fdw_dynamic_parameter_value_needed", ERRCODE_FDW_DYNAMIC_PARAMETER_VALUE_NEEDED }, { "fdw_function_sequence_error", ERRCODE...
not exists:和exists 不和任何列一起使用,后面跟的是一个子查询(查询语句select语句),如果子查询能查出结果,那么这个条件就是成立的,查不出结果条件不成立 条件连接符 and or Between value1 and value2 ;value1的值比value2值小,表示值在value1和value2之间 ...
[,...])postgres=#altertablespacetest_tbsrenametoprod_tbs;postgres=#altertablespacetest_tbsownertotest;--删除表空间postgres=#\helpdroptablespaceCommand:DROPTABLESPACEDescription:removeatablespaceSyntax:DROPTABLESPACE[IFEXISTS]namepostgres=#droptablespaceprod_tbs;DROPTABLESPACE--删除完后,自动生成的目录也会被...
query is '查询的sql'; comment on column pg_log_tue.application_name is '应用名(客户端名)'; drop foreign table if exists pg_log_wed; create foreign table pg_log_wed( log_time timestamp ,user_name text ,database_name text ,process_id integer ,connection_from text ,session_id text ,...
我明白了 ERROR: column "exists" does not exist LINE 1: SELECT EXISTS _colvar 发布于 2 月前 ✅ 最佳回答: 在pl/pgsql表达式手册中可以找到混淆错误的解释,其中解释了: 编写PL/pgSQL语句时,IF expression THEN ...PL/pgSQL将通过向主SQL引擎提供类似SELECT expression的查询来计算表达式 因此,在您的...
CREATEFUNCTIONprice_extension(inventory_item,integer)RETURNSnumeric AS'SELECT $1.price * $2'LANGUAGESQL; SELECTprice_extension(item,10)FROMon_hand; CREATETABLEinventory_item ( name text, supplier_idintegerREFERENCESsuppliers, pricenumericCHECK
CHECK constraint –add logic to check value based on a Boolean expression. UNIQUE constraint –ensure that values in a column or a group of columns are unique across the table. NOT NULL constraint –ensure values in a column are not NULL. DEFAULT constraint –specify a default value for a ...