Write the DDL to construct the Facebook User and Post tables in SQL server.

Question

Write the DDL to construct the Facebook User and Post tables in SQL server. You need to populate the user table with the user’s information provided as in Figure 1 and additional attributes may be needed for the design. Use the ID in the excel file to
identify the other Facebook user. For example ID 612831408762037 is David Cunliffe. Import the excel sheets to SQL server and then write effective SQL to merge the two tables into the Post table. Ensure the relationship is maintained between entities. Submit
the SQL scripts that create the database and tables, import the excel sheets and populate the tables such that one can re-create the database and tables with all the data by running the script.

Answer 1

IF NOT EXISTS(SELECT * FROM sys.databases WHERE name = N'xxx')
CREATE DATABASE xxx
GO
USE xxx
IF EXISTS(SELECT * FROM sys.tables WHERE name = N'DAVID') 
DROP TABLE DAVID;
IF EXISTS(SELECT * FROM sys.tables WHERE name = N'JOHN')
DROP TABLE JOHN;
IF EXISTS(SELECT * FROM sys.tables WHERE name = N'NEWDAVID') 
DROP TABLE NEWDAVID;
IF EXISTS(SELECT * FROM sys.tables WHERE name = N'NEWJOHN') 
DROP TABLE NEWJOHN;
IF EXISTS(SELECT * FROM sys.tables WHERE name = N'USER') 
DROP TABLE [USER];
IF EXISTS(SELECT * FROM sys.tables WHERE name = N'POST') 
DROP TABLE POST;
CREATE TABLE DAVID(
ID VARCHAR(100),
[MESSAGE] VARCHAR(MAX),
[TYPE] VARCHAR(MAX),
CREATED_TIME VARCHAR(MAX),
UPDATED_TIME VARCHAR(MAX),
SHARES_COUNT VARCHAR(MAX),
[COUNT OF LIKES NAME] VARCHAR(MAX),
[COUNT OF COMMENTS MESSAGE] VARCHAR(MAX),
LINK VARCHAR(MAX),
NAME VARCHAR(MAX),
[DESCRIPTION] VARCHAR(MAX),
CREATE TABLE JOHN(
ID VARCHAR(100),
LINK VARCHAR(MAX),
NAME VARCHAR(MAX),
[DESCRIPTION] VARCHAR(MAX),
[TYPE] VARCHAR(MAX),
CREATED_TIME VARCHAR(MAX),
UPDATED_TIME VARCHAR(MAX),
[COUNT OF LIKES NAME] VARCHAR(MAX),
[COUNT OF COMMENTS MESSAGE] VARCHAR(MAX),
[MESSAGE] VARCHAR(MAX),
SHARES_COUNT VARCHAR(MAX),
EXECUTE (N'BULK INSERT DAVID FROM ''' + 'datapath' + N'david.csv''
WITH (
    CHECK_CONSTRAINTS,
    CODEPAGE=''ACP'',
    DATAFILETYPE = ''char'',
    FIELDTERMINATOR= '','',
    ROWTERMINATOR = ''\n'',
    KEEPIDENTITY,
    TABLOCK
EXECUTE (N'BULK INSERT JOHN FROM ''' + 'datapath' + N'john.csv''
WITH (
    CHECK_CONSTRAINTS,
    CODEPAGE=''ACP'',
    DATAFILETYPE = ''char'',
    FIELDTERMINATOR= '','',
    ROWTERMINATOR = ''\n'',
    KEEPIDENTITY,
    TABLOCK
SELECT * FROM DAVID
SELECT * FROM JOHN
CREATE TABLE NEWDAVID(
POST_ID VARCHAR(100),
[USER_ID] VARCHAR(100),
CREATED_DATE VARCHAR(MAX),
CREATED_YEAR VARCHAR(MAX),
CREATED_MONTH VARCHAR(MAX),
UPDATED_DATE VARCHAR(MAX),
UPDATED_YAER VARCHAR(MAX),
UPDATED_MONTH VARCHAR(MAX),
[MESSAGE] VARCHAR(MAX),
SHARES_COUNT VARCHAR(MAX),
[COUNT OF LIKES NAME] VARCHAR(MAX),
[COUNT OF COMMENTS MESSAGE] VARCHAR(MAX),
NAME VARCHAR(MAX),
[TYPE] VARCHAR(MAX),
LINK VARCHAR(MAX),
[DESCRIPTION] VARCHAR(MAX),
CREATE TABLE NEWJOHN(
POST_ID VARCHAR(100),
[USER_ID] VARCHAR(100),
CREATED_DATE VARCHAR(MAX),
CREATED_YEAR VARCHAR(MAX),
CREATED_MONTH VARCHAR(MAX),
UPDATED_DATE VARCHAR(MAX),
UPDATED_YAER VARCHAR(MAX),
UPDATED_MONTH VARCHAR(MAX),
[MESSAGE] VARCHAR(MAX),
SHARES_COUNT VARCHAR(MAX),
[COUNT OF LIKES NAME] VARCHAR(MAX),
[COUNT OF COMMENTS MESSAGE] VARCHAR(MAX),
NAME VARCHAR(MAX),
[TYPE] VARCHAR(MAX),
LINK VARCHAR(MAX),
[DESCRIPTION] VARCHAR(MAX),
INSERT INTO NEWJOHN
SELECT SUBSTRING(ID, CHARINDEX('_', ID) + 1, LEN(ID) - CHARINDEX('_', ID)) AS POST_ID, 
  SUBSTRING(ID, 1, CHARINDEX('_', ID) -1) AS [USER_ID], 
  SUBSTRING(CREATED_TIME, 1, 10) AS CREATED_DATE,
  SUBSTRING(CREATED_TIME, 1, 4) AS CREATED_YEAR,
  SUBSTRING(CREATED_TIME, 6, 2) AS CREATED_MONTH,
  SUBSTRING(UPDATED_TIME, 1, 10) AS UPDATED_DATE,
  SUBSTRING(UPDATED_TIME, 1, 4) AS UPDATED_YEAR,
  SUBSTRING(UPDATED_TIME, 6, 2) AS UPDATED_MONTH,
  [MESSAGE], SHARES_COUNT, [COUNT OF LIKES NAME], [COUNT OF COMMENTS MESSAGE], NAME, [TYPE], LINK, [DESCRIPTION]
FROM JOHN
INSERT INTO NEWDAVID
SELECT SUBSTRING(ID, CHARINDEX('_', ID) + 1, LEN(ID) - CHARINDEX('_', ID)) AS POST_ID, 
       SUBSTRING(ID, 1, CHARINDEX('_', ID) -1) AS [USER_ID], 
  SUBSTRING(CREATED_TIME, 1, 10) AS CREATED_DATE,
  SUBSTRING(CREATED_TIME, 1, 4) AS CREATED_YEAR,
  SUBSTRING(CREATED_TIME, 6, 2) AS CREATED_MONTH,
  SUBSTRING(UPDATED_TIME, 1, 10) AS UPDATED_DATE,
  SUBSTRING(UPDATED_TIME, 1, 4) AS UPDATED_YEAR,
  SUBSTRING(UPDATED_TIME, 6, 2) AS UPDATED_MONTH,
  [MESSAGE], SHARES_COUNT, [COUNT OF LIKES NAME], [COUNT OF COMMENTS MESSAGE], NAME, [TYPE], LINK, [DESCRIPTION]
FROM DAVID
SELECT * FROM NEWDAVID
SELECT * FROM NEWJOHN
CREATE TABLE POST (
POST_ID VARCHAR(100) NOT NULL,
[USER_ID] VARCHAR(100),
CREATED_DATE VARCHAR(MAX),
CREATED_YEAR VARCHAR(MAX),
CREATED_MONTH VARCHAR(MAX),
UPDATED_DATE VARCHAR(MAX),
UPDATED_YAER VARCHAR(MAX),
UPDATED_MONTH VARCHAR(MAX),
[MESSAGE] VARCHAR(MAX),
SHARES_COUNT VARCHAR(MAX),
[COUNT OF LIKES NAME] VARCHAR(MAX),
[COUNT OF COMMENTS MESSAGE] VARCHAR(MAX),
NAME VARCHAR(MAX),
[TYPE] VARCHAR(MAX),
LINK VARCHAR(MAX),
[DESCRIPTION] VARCHAR(MAX),
INSERT INTO POST
SELECT * FROM NEWDAVID UNION SELECT * FROM NEWJOHN
SELECT * FROM POST 
CREATE TABLE [USER] 
[USER_ID] VARCHAR(100) NOT NULL,
INSERT INTO [USER] VALUES (612831408762037),(1119736203) 
ALTER TABLE [USER] ADD PRIMARY KEY([USER_ID])
ALTER TABLE POST ADD PRIMARY KEY(POST_ID) 
ALTER TABLE POST ADD FOREIGN KEY([USER_ID]) REFERENCES [USER]([USER_ID])