PostgreSQL Programmer's Guide (PDF)
19 Pages1580 Words154 Views
Added on 2021-05-31
PostgreSQL Programmer's Guide (PDF)
Added on 2021-05-31
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PostgreSQL Procedure:In this PostgreSQL and procedural languages like PL/pgSQL, C, Perl, Python, and Tcl areused to refer some stored procedures. It adds many elements like control flows, loops, andcomplex operation to additive SQL-standard. And merely allows user to create many complexoperation which is not possible in plain SQL statements.PostgreSQL stored proceduresThe PostgreSQL allows the user to add more functions on the database as per the user wish, herethe user can create functions and many complex operations and get the expected results. Steps to create functionsInitially the user need to provide the function name, it can be done by using “CREATEFUNCTION”. For example:After created the function use comma to separate list of arguments which are placedinside the parenthesis followed by the function name.And, the user need to specify the return type of the function for retuning some valueseither by calculation or default values.A BEGIN key word followed by the return type is mention the start of the function andthe keyword END used to close the function.Finally, the language used for the function need to specified by the user which isPL/pgSQL.1
Example:Grieg server Settings up:The Grieg server need to install on your system, before using the server and it is one of thebasic environment and output screen for the complex function of the PL/pgSQL. We need tofollow the basic commands for executing PL/pgSQL function:We need to add this command on the grieg server to perform the complex operation. $ createdb proj2 $ psql proj2 -f /home/cs9311/web/18s1/proj/proj2/mymyunsw.dumpThe user of this server need to ensure that the process are going perfect for the abovecommands, if some anomalies found need to get the solution.After the successful execution of the “createdb” the output will beSETCREATE EXTENSIONCOMMENT SET CREATE DOMAIN CREATE DOMAIN CREATE DOMAINCREATE DOMAIN CREATE TYPE CREATE DOMAIN ... a whole bunch of theseCREATE DOMAIN CREATE FUNCTION CREATE FUNCTION SET CREATETABLE CREATE TABLE ALTER TABLE ALTER TABLE ALTER TABLEWe need more concentration on the error because this may be lead to many confusionwhile performing a complex calculations.We can use large database on the server and made some calculations on the server toget the expected result.2
Examples$ psql proj2...PostgreSQL welcome stuff....proj2=# \d ... look at the schema ... proj2=# select * from Students; ... look at the Students table ... proj2=# select p.unswid,p.name from People p join Students s on (p.id=s.id); ... look at the names and UNSW ids of all students ... proj2=# select p.unswid,p.name,s.phone from People p join Staff s on (p.id=s.id); ... look at the names, staff ids, and phone #s of all staff ... proj2=# select count(*) from Course_Enrolments; ... how many course enrolment records ... proj2=# select * from dbpop(); ... how many records in all tables ... proj2=# ... etc. etc. etc. proj2=# \q3
Implementing Sql Query:Querying the database:Querying and Views:Query:Query are used to retrieval the data.so many of the Statement are used to retrieval the data.View:View command used to select the table and viewed easily. The command are SELECT statement, not the result.DML:DML stands for Data Manipulation language. It is used to select the number of the database from the database table using the sql command. After completing the performance, the result is viewed as the table form.SYNTAX:SELECT column listFROM table nameWHERE selected nameORDER BY column listTwo table are Selected:4
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