sql programming books

Tags: case sensitive keyword Scratch database order number--1. Common stored ProceduresSp_databases--Returns a list of available databasesSp_tables--Returns a list of available tables in the currently selected database, including not only your own tables, but also system tables and other tablesSp_tables null, dbo, scratch, "' Table '"--returns only the available tables for the currently selected database, excluding views and system tablesSp_columns ARPU--Displays the columns of the table ARPU--2

screen.DECLARE sum_i int:=0; I int:=0; Begin while i3. For statementGrammar:For variable_counter_name in [reverse] lower_limit. Upper_limit loop plsql_sentence; End Loop;Variable_counter_name: Represents a variable, usually an integer type, that is used as a counter.By default, the value of the counter is incremented, and when you use the reverse keyword in a loop, the value of the counter decrements with the loop.Lower_limit: The counter lower value, which exits the loop when the value of the

(tablenameinch varchar2, Curpageinch Number, Pagerownuminch Number, ORDERFLGinch varchar2, Totalrownum out Number, Totalpagenum out Number, res_cursor out Sp_pack_pagebycursor.p_cursor) is--defining SQL statement variablesV_sqlvarchar2( +);--define the query start subscriptV_begin_rownum Number:=(Curpage-1)*Pagerownum+1;--The following table defines the end of the queryV_end_rownum Number:=Curpage*Pagerownum;--Executionbegin--define database query

Tags: tables tab odd ext arc version equals char while loop---------------------------T-SQL Programming--------------------------1. Declaring variables--declare @name nvarchar (50)--declare @age int declare @name nvarchar (), @age int --2. Assigning a value to a variableSet @name = ' Liu Yarong ' Select @age =18 --3. OutputSelect ' Name ', @nameSelect ' Age ', @age --Error!--print ' FDS ', @name --while Cyc

Defining local Variables Declare @num int Path One:set@num=5 Way Two:select@num =5 Differences in how set and select are assigned The only difference is that if you get data from a database table, you can only use Select Declare @name nvarchar (+) Select @name = stuname from Student where studentno=5 Type conversions Declare @num int Set @num=123 Print 'the value of num is'+cast(@num as nvarchar( +)) Print 'the value of num is'+Convert(nvarchar( +)@num) --date turns into a string Declare

; - Then RAISE age_exception;END IF;(3) in the Plsql abnormal handling part of the abnormal situation to make corresponding treatment.EXCEPTION when Then dbms_output.put_line (' age is only between 0-100! ');Example: (Judging whether the age is between 0-100)DECLAREV_age Number:= Age ; Age_exception EXCEPTION;BEGIN IFV_age 0 ORV_age> - ThenRAISE age_exception; END IF; EXCEPTION whenAge_exception ThenDbms_output.put_line ('age can only be between 0-100! ');END;Except

can have multiple return values through an out-type parameter implementation--Requirements: Define a function: Gets the sum of the payroll for a given department and the total number of employees in that department (defined as an out type parameter).Requirement: The department number is defined as a parameter and the payroll is defined as the return value.Run:You can use the default keyword to set the defaults for input parameters when declaring a function parameter in the Create OR replacefunc

Tags: SqlContext case class registerastable Schemardd DSLFirst create the Sparkcontext context:The stealth conversion is then introduced to turn the RDD into Schemardd:Next, define a case class to use to describe and store each row of data in the SQL table:The next step is to load the data, where the test data is the User.txt file:We created a good use.txt to add content and upload it to HDFs:Web Console query:HDFs Command query:Load data:Verify that

Label: ----------------------------------SQL Programming--------------------------------- --1. Declaring Variables --declare @name varchar (a) --declare @age int --declare multiple variables at the same time Declare @name varchar( -) ,@age int --2. Assigning values to variables Set @name='Lisa' --Mode 1 Select @age= - --Mode 2 --3. Output Select 'name',@name Select 'Age',@age ---4, while Loop Declar

use PREPARE:A:prepare Stmt_name from Preparable_stmt, and defines a language, and gives it to Stmt_name, Tmt_name is the size of the word.B: Even in the preparable_stmt sentence? Represents a string, and you don't need to. Included in the primer.C: If the new PREPARE language uses an existing stmt_name, then the original will be released immediately! Even if this new PREPARE language is wrong, it cannot be done correctly.The scope of the D:prepare Stmt_name is when the pre-client connection is

main SELECT statement if it is specified. The ORDER by clause is available and is required for top-n analysis. NBSP; 3. There are two comparison criteria that can be used in a subquery: the single-line operator and the multi-line operators. NBSP; NBSP; Single-row subquery: A query that returns only one row from the inner SELECT statement NBSP; Multiline subquery: Query that returns multiple rows from the inside SELECT statement NBSP; NBSP; a single-line subquery is a query that returns a