1、创建数据库 CREATE DATABASE runoobdb #创建数据库,数据库名为runoobdb 1. 2、选择数据库 \l查看已经存在的数据库 1. 连接所选择的数据库 3、删除数据库 4、创建表格 1、数据类型 Numeric(10,2) 指字段是数字型,长度为10 小数为两位的。其中10为精度,2为小数位数 numeric类型的小数位数是小数点右边的...
DATA_TYPE1 ); create sequence test_plpgsql.empno_seq; /* * DML作成 */ CREATE OR REPLACE PROCEDURE test_plpgsql.main() AS $$ DECLARE BEGIN SET SEARCH_PATH='test_plpgsql'; perform setval ('empno_seq', 1, false); -- マスタデータ登録 -- 部署 INSERT INTO test_plpgsql.dept VALUES (...
perf.data的原始数据perf script即可输出。 生成火焰图 # git clone https://github.com/brendangregg/FlameGraph # or download it from github# mv perf.data FlameGraph/# cd FlameGraph# perf script | ./stackcollapse-perf.pl > out.perf-folded# cat out.perf-folded | ./flamegraph.pl > perf-kern...
16 AS pageopqdata, /* per tuple header: add IndexAttributeBitMapData if some cols are null-able */ CASE WHEN max(coalesce(s.null_frac,0)) = 0 THEN 2 -- IndexTupleData size ELSE 2 + (( 32 + 8 - 1 ) / 8) -- IndexTupleData size + IndexAttributeBitMapData size ( max num ...
drop database [if exists]+ 数据库的名称 创建表 CREATE TABLE DEPARTMENT( ID INT PRIMARY KEY NOT NULL, DEPT CHAR(50) NOT NULL, EMP_ID INT NOT NULL); 查看表的基本信息 \d +表名 删除表 drop table +表名 2.pgsql的模式 可以看成一个表的集合,包含视图、索引、据类型、函数和操作符等。
Osm2pgsql is an essential part of many services that take OSM data and create maps from it. It is also used in the Nominatim geocoder and numerous other applications processing OSM data. More about osm2pgsql: Features Project history Who is using osm2pgsql?Examples...
Variable Assignment: Any value as accepted by data type, constant, or expression can be assigned to the variable. This part is optional. The user can print variable values by using RAISE NOTICE/EXCEPTION and “%” as a placeholder to be replaced by the variable value. Let’s see an exam...
SQL查询表占用空间大小. create table tmp (name varchar(50),rows int,reserved varchar(50),data varchar(50),index_size varchar(50),unused varchar(50))insert into tmp (name,rows,reserved,data,index_size,unused) exec sp_msforeachTable @Command1="sp_spaceused '?'&q ...
Second, split a string literal into two parts using a space, return the first part, and assign it to the first_name variable: first_name = split_part('John Doe',' ', 1); Third, display the value of the first_name variable using the raise notice statement: raise notice 'The first ...
pgsql_CopyData("place", Connection, buffer); buffer.clear(); } void delete_unused_full(char osm_type, osmid_t osm_id) { if (m_options.append) { places.clear(); delete_place(osm_type, osm_id); } } struct pg_conn *Connection; struct pg_conn *ConnectionDelete; struct pg_conn *...