postgres=#createtabletbl(idintprimarykey,infotext);CREATETABLEpostgres=#createtabletbl1(idintreferencestbl(id), infotext);CREATETABLEpostgres=# \d tblTable"public.tbl"Column|Type|Modifiers---+---+---id|integer|notnullinfo|text|Indexes: "tbl_pkey"PRIMARYKEY, btree (id) Referencedby:TABLE"tbl...
postgres=# create table tbl(id int primary key,info text);CREATE TABLEpostgres=# create table tbl1(id int references tbl(id), info text);CREATE TABLEpostgres=# \d tblTable "public.tbl"Column | Type | Modifiers---+---+---id | integer | not nullinfo | text |Indexes:"tbl_pkey" PR...
CREATE INDEX name ON table USING GIN(column); 创建一个基于 GIN(通用倒排索引)的索引。column必须是tsvector类型。 CREATE INDEX name ON table USING GIST(column); 创建一个基于 GiST(通用搜索树)的索引。column可以是tsvector或tsquery类型。 GIN 索引是更好的文本搜索索引类型。作为倒排索引,每个词(词位)在...
RENAME [ COLUMN ] column TO new_column ALTER TABLE name RENAME TO new_name 其中action可以是以选项之一: ADD [ COLUMN ] column_type [ column_constraint [ ... ] ] DROP [ COLUMN ] column [ RESTRICT | CASCADE ] ALTER [ COLUMN ] column TYPE type [ USING expression ] ALTER [ COLUMN ] ...
[NULLS{FIRST|LAST}][,...]][LIMIT{count|ALL}][OFFSETstart[ROW|ROWS]][FETCH{FIRST|NEXT}[count]{ROW|ROWS}ONLY][FOR{UPDATE|NOKEYUPDATE|SHARE|KEYSHARE}[OFtable_name[,...]][NOWAIT|SKIPLOCKED][...]]#from_item 可以是以下选项之一[ONLY]table_name[*][[AS]alias[(column_alias[,...])]...
ALTER TABLE [ ONLY ] name [ * ] action [, ... ] ALTER TABLE [ ONLY ] name [ * ] RENAME [ COLUMN ] column TO new_column ALTER TABLE name RENAME TO new_name其中action 可以是以选项之一:ADD [ COLUMN ] column_type [ column_constraint [ ... ] ] DROP [ COLUMN ] column [ ...
CREATE TABLE table_name ( ... ) [ PARTITION BY { RANGE | LIST } ( { column_name | ( expression ) } 1. 2. 2、创建分区(子表) CREATE TABLE table_name PARTITION OF parent_table [ ( ) ] FOR VALUES partition_bound_spec 1.
/* current size of file (0 if not temporary) */char*fileName;/* name of file, or NULL for unused VFD *//* NB: fileName is malloc'd, and must be free'd when closing the VFD */intfileFlags;/* open(2) flags for (re)opening the file */mode_tfileMode;/* mode to pass to ...
alter table [表名] rename column [旧字段名] to [新字段名]; 例:把表table_ex字段col_1限制非空去掉:ALTER TABLE table_eg ALTER col_1 drop not NULL 12.1 更改字段属性,含空格 如果把字段colname把属性Text转化为int,原来text里面存在空啥的,可以 ...
SchemaName String 否 所要描述的数据库对象,所属的模式名称。当描述对象不为database、schema时,此参数必选。注意:此字段可能返回 null,表示取不到有效值。示例值:test_schema TableName String 否 所要描述的数据库对象,所属的表名称。当描述的对象类型为column时,此参数必填。注意:此字段可能返回 null,表示取...