Examining the table for null values

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Tue May 21 2024 07:48:24 GMT+0000 (Coordinated Universal Time)

Saved by @Uncoverit #sql

-- Examining the table for null values
SELECT COUNT(*)-COUNT(rating) AS rating
	 , COUNT(*)-COUNT(numberofreviews) AS n_of_reviews
	 , COUNT(*)-COUNT(isbn) AS isbn
	 , COUNT(*)-COUNT(publishing_year) AS publishing_year
	 , COUNT(*)-COUNT(genres) AS genres
	 , COUNT(*)-COUNT(rating_count) AS rating_count
	 , COUNT(*)-COUNT(title) AS title
FROM PortfolioProject.dbo.Goodreads;

https://github.com/Susanna-Uncover/SQL-projects/blob/Projects/1%20SQL%20Goodreads%20Data%20Cleaning%20Project.sql

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Goodreads project

@Uncoverit

Adding an ID column to improve table navigation Duplicating the first row of data before renaming the columns Renaming the columns Examining the table for null values Updating the missing values to read as NULL Standardising the ratings column Identifying duplicate values Removing duplicate rows Splitting out the author's column based on the author_url column Cleaning up the Genres column Exploring the most popular tags in the genres column Creating filter columns based on the genre hits Updating the filter columns Ordering the columns, filtering out low rating counts and missing isbn rows and non-sci-fi books

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mysql FIND_IN_SET equivalent to postgresql

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DECLARE @AnyDate DATETIME
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SELECT @AnyDate AS 'Input Date',
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DROP TABLE EMP
DROP TABLE DEPT
DROP TABLE BONUS
DROP TABLE SALGRADE
DROP TABLE DUMMY

CREATE TABLE EMP
(EMPNO NUMERIC(4) NOT NULL,
ENAME VARCHAR(10),
JOB VARCHAR(9),
MGR NUMERIC(4),
HIREDATE DATETIME,
SAL NUMERIC(7, 2),
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INSERT INTO EMP VALUES
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INSERT INTO EMP VALUES
(7521, 'WARD', 'SALESMAN', 7698, '22-FEB-1981', 1250, 500, 30)
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JOB VARCHAR(9),
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INSERT INTO SALGRADE VALUES (3, 1401, 2000)
INSERT INTO SALGRADE VALUES (4, 2001, 3000)
INSERT INTO SALGRADE VALUES (5, 3001, 9999)

CREATE TABLE DUMMY
(DUMMY NUMERIC)

INSERT INTO DUMMY VALUES (0)

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SQL Select all columns with GROUP BY one column

https://stackoverflow.com/a/39816161/6942743

select 
				   a.id_transaksi_suretyship,
                   b.jenis_suretyship,
                   c.suretyship,
                   d.nomor_sk,
                   d.tgl_sk,
				   d.tgl_sk_cetak,
                   e.nama_principal,
                   f.nama_obligee,
				   a.flag_deletion,
				   a.id_reference,
                   a.nilai_proyek,
                   a.nilai_bond,
                   a.nilai_ijp,
				   a.fee_base persen_fee_base,
				   a.fee_base * a.nilai_ijp/100 fee_base,
				   a.komisi_agen persen_komisi_agen,
				   a.komisi_agen*a.nilai_ijp/100 komisi_agen,
				   a.persen_reasuransi ,
				   --a.persen_reasuransi * a.nilai_ijp/100 reasuransi,
				   a.reasuransi,
				   --coalesce(a.fee_base/100,0)*a.persen_reasuransi * a.nilai_ijp/100 reasuransi_fee_base,
				   a.reasuransi_fee_base,
				   a.persen_coguarantee,
				   a.persen_coguarantee * a.nilai_ijp/100 coguarantee,
				   a.potongan_co persen_potongan_co,
				   a.potongan_co * a.nilai_ijp/100 potongan_co,
				   a.potongan_re persen_potongan_re,
				   a.potongan_re * a.nilai_ijp/100 potongan_re,
				   to_char(a.periode_berlaku + (a.jangka_waktu)* '1 day'::interval, 'DD-MM-YYYY')  jatuh_tempo,
				   to_char(a.periode_berlaku, 'DD-MM-YYYY') periode_berlaku,
				   coalesce(e.jumlah_karyawan,0) tenaga_kerja,
				   --a.nilai_bond * (100-coalesce(a.persen_reasuransi,0))/100 as plafond_or
				   a.plafond_or,
				   a.penjaminan nilai_penjaminan,
				   c.is_konvensional,
				   0 nilai_asuransi_1,
					0 nilai_asuransi_2,
				  (a.fee_base*(a.persen_coguarantee*a.nilai_ijp/100)/100)  coguarantee_fee_base,
				 CASE
				        when cast(usia AS varchar) IS NULL then cast(tanggal_usia AS varchar)
					    else cast(usia AS varchar)
				 END umur,
				  '--' note,
				  case
				  	when d.tgl_sk >= '2016-12-01' and d.tgl_sk <= '2017-11-30' then 
				  	(coalesce(a.reasuransi,0)-(coalesce(a.reasuransi_fee_base,0)))*5/100
				  	when d.tgl_sk >= '2017-12-01' and d.tgl_sk <= '2019-08-31' then 
				  	(coalesce(a.reasuransi,0)-(coalesce(a.reasuransi_fee_base,0)))*7.5/100
				  	when d.tgl_sk > '2019-09-01' then 
				  	(coalesce(a.reasuransi,0)-(coalesce(a.reasuransi_fee_base,0)))*10/100
				  	else 0
				  	end ri_com,
						CASE
							when  d.tgl_sk >= '2019-09-30' and d.tgl_sk <= '2020-04-30' then
							((COALESCE(a.persen_coguarantee,0)* a.nilai_ijp/100)-((COALESCE(a.persen_coguarantee,0)* a.nilai_ijp/100)*(COALESCE(a.fee_base,0)/100)))*5/100
							when  d.tgl_sk >= '2020-05-01'  then
							((COALESCE(a.persen_coguarantee,0)* a.nilai_ijp/100)-((COALESCE(a.persen_coguarantee,0)* a.nilai_ijp/100)*(COALESCE(a.fee_base,0)/100)))*7.5/100
							ELSE 0
							end komisi_co,
							0 komisi_asuransi
							--(ijp cogar - feebase cogar) x persen komisi

						

                from 
                  v_tr_transaksi_suretyship a
                  inner join mt_jenis_suretyship b on a.id_jenis_suretyship = b.id_jenis_suretyship
                  inner join mt_suretyship c on b.id_mt_suretyship = c.id_mt_suretyship
                  inner join tr_sertifikat_penjaminan d on a.id_sertifikat = d.id_sertifikat
                  inner join mt_principal e on a.id_principal = e.id_principal
                  inner join mt_obligee f on a.id_obligee = f.id_obligee
				  Left join mt_agen g on a.id_mt_agen=g.id_mt_agen
				  left join mt_broker h on d.reas_id_broker = h.id_broker
    	 
	            where 
				--( a.flag_deletion is null OR (a.flag_deletion is not null and a.change_date > '2020-07-31') ) AND
				--d.id_reference is null and
				--a.flag_deletion is null and
	              -- d.tgl_sk >='2015-01-01'  and d.tgl_sk<='2020-07-31'
				  a.flag_deletion is null and 		
					d.flag_delete is null and 
					( 
						( tgl_sk >='2015-01-01' and  tgl_sk <='2020-07-31'  and 
							( tgl_sk_cetak is null or ( tgl_sk_cetak is not null and d.id_reference is null) ) 
						) OR  
						
						( tgl_sk_cetak >='2015-01-01' and  tgl_sk_cetak <='2020-07-31' and d.id_reference is not null)
					)  
					
	          
				 union all
				 select 
					a.id_transaksi_suretyship,
                   b.jenis_suretyship,
                   c.suretyship,
                   d.nomor_sk,
                   d.tgl_sk,
				   d.tgl_sk_cetak,
                   e.nama_principal,
                   f.nama_bank_cabang as nama_obligee,
				   a.flag_deletion,
				   a.id_reference,
                   a.nilai_proyek,
                   a.nilai_bond,
                   a.nilai_ijp,
				   a.fee_base persen_fee_base,
				   a.fee_base * a.nilai_ijp/100 fee_base,
				   a.komisi_agen persen_komisi_agen,
				   a.komisi_agen*a.nilai_ijp/100 komisi_agen,
				   a.persen_reasuransi ,
				   --a.persen_reasuransi * a.nilai_ijp/100 reasuransi,
				   a.reasuransi,
				   --coalesce(a.fee_base/100,0)*a.persen_reasuransi * a.nilai_ijp/100 reasuransi_fee_base,
				   a.reasuransi_fee_base,
				   a.persen_coguarantee,
				   a.persen_coguarantee * a.nilai_ijp/100 coguarantee,
				   a.potongan_co persen_potongan_co,
				   a.potongan_co * a.nilai_ijp/100 potongan_co,
				   a.potongan_re persen_potongan_re,
				   a.potongan_re * a.nilai_ijp/100 potongan_re,
				   to_char(a.periode_berlaku + (a.jangka_waktu)* '1 MONTH'::interval, 'DD-MM-YYYY') jatuh_tempo,
				   to_char(a.periode_berlaku, 'DD-MM-YYYY') periode_berlaku,
				   coalesce(e.jumlah_karyawan,0) tenaga_kerja,
				   --a.nilai_bond * (100-coalesce(a.persen_reasuransi,0))/100 as plafond_or
					a.plafond_or,
					a.penjaminan nilai_penjaminan,
					c.is_konvensional, 
					0 nilai_asuransi_1,
					0 nilai_asuransi_2,
					(a.fee_base*(a.persen_coguarantee*a.nilai_ijp/100)/100)  coguarantee_fee_base,
					case
					    when cast(usia AS varchar) IS NULL then cast(tanggal_usia AS varchar)
					    else cast(usia AS varchar)
					end    
					 umur,
				    '--' note,
				  case
				  	when d.tgl_sk >= '2016-12-01' and d.tgl_sk <= '2017-11-30' then 
				  	(coalesce(a.reasuransi,0)-(coalesce(a.reasuransi_fee_base,0)))*5/100
				  	when d.tgl_sk >= '2017-12-01' and d.tgl_sk <= '2019-08-31' then 
				  	(coalesce(a.reasuransi,0)-(coalesce(a.reasuransi_fee_base,0)))*7.5/100
				  	when d.tgl_sk > '2019-09-01' then 
				  	(coalesce(a.reasuransi,0)-(coalesce(a.reasuransi_fee_base,0)))*10/100
				  	else 0
				  	end ri_com,
						CASE
							when  d.tgl_sk >= '2019-09-30' and d.tgl_sk <= '2020-04-30' then
							((COALESCE(a.persen_coguarantee,0)* a.nilai_ijp/100)-((COALESCE(a.persen_coguarantee,0)* a.nilai_ijp/100)*(COALESCE(a.fee_base,0)/100)))*5/100
							when  d.tgl_sk >= '2020-05-01'  then
							((COALESCE(a.persen_coguarantee,0)* a.nilai_ijp/100)-((COALESCE(a.persen_coguarantee,0)* a.nilai_ijp/100)*(COALESCE(a.fee_base,0)/100)))*7.5/100
							ELSE 0
							end komisi_co,
							0 komisi_asuransi
                from 
                  v_tr_transaksi_suretyship a
                  inner join mt_jenis_suretyship b on a.id_jenis_suretyship = b.id_jenis_suretyship
                  inner join mt_suretyship c on b.id_mt_suretyship = c.id_mt_suretyship
                  inner join tr_sertifikat_penjaminan d on a.id_sertifikat = d.id_sertifikat
                  inner join mt_principal e on a.id_principal = e.id_principal
                  inner join mt_bank_cabang f on d.id_mt_bank_cabang = f.id_mt_bank_cabang
				  Left join mt_agen g on a.id_mt_agen=g.id_mt_agen
				  left join mt_broker h on d.reas_id_broker = h.id_broker
    	 
	            where
				--	( a.flag_deletion is null OR (a.flag_deletion is not null and a.change_date > '2020-07-31') ) AND				
				--d.id_reference is null and
				--	a.flag_deletion is null and
	             --  d.tgl_sk >='2015-01-01'  and d.tgl_sk<='2020-07-31'
				 a.flag_deletion is null and 		
				d.flag_delete is null and 
				( 
					( tgl_sk >='2015-01-01' and  tgl_sk <='2020-07-31'  and 
						( tgl_sk_cetak is null or ( tgl_sk_cetak is not null and d.id_reference is null) ) 
					) OR  
					
					( tgl_sk_cetak >='2015-01-01' and  tgl_sk_cetak <='2020-07-31' and d.id_reference is not null)
				) and 
				c.id_mt_suretyship != 9
	              
	                union all
				 select 
					a.id_transaksi_suretyship,
                   b.jenis_suretyship,
                   c.suretyship,
                   d.nomor_sk,
                   d.tgl_sk,
				   d.tgl_sk_cetak,
                   e.nama_principal,
                   f.nama_bank_cabang as nama_obligee,
				   a.flag_deletion,
				   a.id_reference,
                   a.nilai_proyek,
                   a.nilai_bond,
                   a.nilai_ijp,
				   a.fee_base persen_fee_base,
				   a.fee_base * a.nilai_ijp/100 fee_base,
				   a.komisi_agen persen_komisi_agen,
				   a.komisi_agen*a.nilai_ijp/100 komisi_agen,
				   a.persen_reasuransi ,
				   --a.persen_reasuransi * a.nilai_ijp/100 reasuransi,
				   a.reasuransi,
				   --coalesce(a.fee_base/100,0)*a.persen_reasuransi * a.nilai_ijp/100 reasuransi_fee_base,
				   a.reasuransi_fee_base,
				   a.persen_coguarantee,
				   a.persen_coguarantee * a.nilai_ijp/100 coguarantee,
				   a.potongan_co persen_potongan_co,
				   a.potongan_co * a.nilai_ijp/100 potongan_co,
				   a.potongan_re persen_potongan_re,
				   a.potongan_re * a.nilai_ijp/100 potongan_re,
				   to_char(a.periode_berlaku + (a.jangka_waktu)* '1 MONTH'::interval, 'DD-MM-YYYY') jatuh_tempo,
				   to_char(a.periode_berlaku, 'DD-MM-YYYY') periode_berlaku,
				   coalesce(e.jumlah_karyawan,0) tenaga_kerja,
				   --a.nilai_bond * (100-coalesce(a.persen_reasuransi,0))/100 as plafond_or
					a.plafond_or,
					a.penjaminan nilai_penjaminan,
					c.is_konvensional, 
					nilai_asuransi_1,
					nilai_asuransi_2,
					(a.fee_base*(a.persen_coguarantee*a.nilai_ijp/100)/100)  coguarantee_fee_base,
					case
					    when cast(usia AS varchar) IS NULL then cast(tanggal_usia AS varchar)
					    else cast(usia AS varchar)
					end    
					 umur,
				    a.catatan note,
				  case
				  	when d.tgl_sk >= '2016-12-01' and d.tgl_sk <= '2017-11-30' then 
				  	(coalesce(a.reasuransi,0)-(coalesce(a.reasuransi_fee_base,0)))*5/100
				  	when d.tgl_sk >= '2017-12-01' and d.tgl_sk <= '2019-08-31' then 
				  	(coalesce(a.reasuransi,0)-(coalesce(a.reasuransi_fee_base,0)))*7.5/100
				  	when d.tgl_sk > '2019-09-01' then 
				  	(coalesce(a.reasuransi,0)-(coalesce(a.reasuransi_fee_base,0)))*10/100
				  	else 0
				  	end ri_com,
						CASE
							when  d.tgl_sk >= '2019-09-30' and d.tgl_sk <= '2020-04-30' then
							((COALESCE(a.persen_coguarantee,0)* a.nilai_ijp/100)-((COALESCE(a.persen_coguarantee,0)* a.nilai_ijp/100)*(COALESCE(a.fee_base,0)/100)))*5/100
							when  d.tgl_sk >= '2020-05-01'  then
							((COALESCE(a.persen_coguarantee,0)* a.nilai_ijp/100)-((COALESCE(a.persen_coguarantee,0)* a.nilai_ijp/100)*(COALESCE(a.fee_base,0)/100)))*7.5/100
							ELSE 0
							end komisi_co,
							nilai_asuransi_2 * 5/100 komisi_asuransi
                from 
                  v_tr_transaksi_suretyship_asuransi a
                  inner join mt_jenis_suretyship b on a.id_jenis_suretyship = b.id_jenis_suretyship
                  inner join mt_suretyship c on b.id_mt_suretyship = c.id_mt_suretyship
                  inner join tr_sertifikat_penjaminan d on a.id_sertifikat = d.id_sertifikat
                  inner join mt_principal e on a.id_principal = e.id_principal
                  inner join mt_bank_cabang f on d.id_mt_bank_cabang = f.id_mt_bank_cabang
				  Left join mt_agen g on a.id_mt_agen=g.id_mt_agen
				  left join mt_broker h on d.reas_id_broker = h.id_broker
    	          left join (
                    SELECT id_transaksi_suretyship, 
                            sum(nilai_asuransi_1)  nilai_asuransi_1, 
                            sum(nilai_asuransi_2)  nilai_asuransi_2 FROM (
                                SELECT
                                    id_transaksi_suretyship,
                                        CASE 
                                                    WHEN  
                                                        id_asuransi = 1
                                                    THEN
                                                        nilai_asuransi
                                                    ELSE
                                                        0
                                                END AS nilai_asuransi_1,
                                        CASE 
                                                    WHEN  
                                                        id_asuransi = 2
                                                    THEN
                                                        nilai_asuransi
                                                    ELSE
                                                        0
                                                END AS nilai_asuransi_2 
                                FROM
                                tr_transaksi_suretyship_ext	 
                            ) ss GROUP BY id_transaksi_suretyship
                ) i ON a.id_transaksi_suretyship = i.id_transaksi_suretyship
	            where
				--	( a.flag_deletion is null OR (a.flag_deletion is not null and a.change_date > '2020-07-31') ) AND				
				--d.id_reference is null and
				--	a.flag_deletion is null and
	             --  d.tgl_sk >='2015-01-01'  and d.tgl_sk<='2020-07-31'
				 a.flag_deletion is null and 		
				d.flag_delete is null and 
				( 
					( tgl_sk >='2015-01-01' and  tgl_sk <='2020-07-31'  and 
						( tgl_sk_cetak is null or ( tgl_sk_cetak is not null and d.id_reference is null) ) 
					) OR  
					
					( tgl_sk_cetak >='2015-01-01' and  tgl_sk_cetak <='2020-07-31' and d.id_reference is not null)
				) and 
				c.id_mt_suretyship = 9

How to Search and Destroy Non-SARGable Queries on Your Server - Data with Bert

-- From https://github.com/bertwagner/SQLServer/blob/master/Non-SARGable%20Execution%20Plans.sql
-- This script will check the execution plan cache for any queries that are non-SARGable.
-- It does this by finding table and index scans that contain a scalar operators

SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
 
DECLARE @dbname SYSNAME
SET @dbname = QUOTENAME(DB_NAME());
 
WITH XMLNAMESPACES (DEFAULT 'http://schemas.microsoft.com/sqlserver/2004/07/showplan')

SELECT
   stmt.value('(@StatementText)[1]', 'varchar(max)') AS [Query],
   query_plan AS [QueryPlan],
   sc.value('(.//Identifier/ColumnReference/@Schema)[1]', 'varchar(128)') AS [Schema], 
   sc.value('(.//Identifier/ColumnReference/@Table)[1]', 'varchar(128)') AS [Table], 
   sc.value('(.//Identifier/ColumnReference/@Column)[1]', 'varchar(128)') AS [Column] ,
   CASE WHEN s.exist('.//TableScan') = 1 THEN 'TableScan' ELSE 'IndexScan' END AS [ScanType],
   sc.value('(@ScalarString)[1]', 'varchar(128)') AS [ScalarString]
FROM 
	sys.dm_exec_cached_plans AS cp
	CROSS APPLY sys.dm_exec_query_plan(cp.plan_handle) AS qp
	CROSS APPLY query_plan.nodes('/ShowPlanXML/BatchSequence/Batch/Statements/StmtSimple') AS batch(stmt)
	CROSS APPLY stmt.nodes('.//RelOp[TableScan or IndexScan]') AS scan(s)
	CROSS APPLY s.nodes('.//ScalarOperator') AS scalar(sc)
WHERE
    s.exist('.//ScalarOperator[@ScalarString]!=""') = 1 
    AND sc.exist('.//Identifier/ColumnReference[@Database=sql:variable("@dbname")][@Schema!="[sys]"]') = 1
	AND sc.value('(@ScalarString)[1]', 'varchar(128)') IS NOT NULL

Get the field type for each column in a table

SELECT column_name as 'Column Name', data_type as 'Data Type'
FROM information_schema.columns
WHERE table_name = 'hrStaff'

mysql - Disable ONLY_FULL_GROUP_BY - Stack Overflow

mysql > SET GLOBAL sql_mode=(SELECT REPLACE(@@sql_mode,'ONLY_FULL_GROUP_BY',''));

SQL Server: Extract Table Meta-Data (description, fields and their data types) - Stack Overflow

SELECT
    TableName = tbl.table_schema + '.' + tbl.table_name, 
    TableDescription = tableProp.value,
    ColumnName = col.column_name, 
    ColumnDataType = col.data_type,
    ColumnDescription = colDesc.ColumnDescription
FROM information_schema.tables tbl
INNER JOIN information_schema.columns col 
    ON col.table_name = tbl.table_name
LEFT JOIN sys.extended_properties tableProp 
    ON tableProp.major_id = object_id(tbl.table_schema + '.' + tbl.table_name) 
        AND tableProp.minor_id = 0
        AND tableProp.name = 'MS_Description' 
LEFT JOIN (
    SELECT sc.object_id, sc.column_id, sc.name, colProp.[value] AS ColumnDescription
    FROM sys.columns sc
    INNER JOIN sys.extended_properties colProp
        ON colProp.major_id = sc.object_id
            AND colProp.minor_id = sc.column_id
            AND colProp.name = 'MS_Description' 
) colDesc
    ON colDesc.object_id = object_id(tbl.table_schema + '.' + tbl.table_name)
        AND colDesc.name = col.COLUMN_NAME
WHERE tbl.table_type = 'base table'
--AND tableProp.[value] IS NOT NULL OR colDesc.ColumnDescription IS NOT null

sql - How to list active connections on PostgreSQL? - Stack Overflow

SELECT * FROM pg_stat_activity;

Rolling up multiple rows into a single row and column for SQL Server data

SELECT 
   SS.SEC_NAME,
   STUFF((SELECT '; ' + US.USR_NAME 
          FROM USRS US
          WHERE US.SEC_ID = SS.SEC_ID
          ORDER BY USR_NAME
          FOR XML PATH('')), 1, 1, '') [SECTORS/USERS]
FROM SALES_SECTORS SS
GROUP BY SS.SEC_ID, SS.SEC_NAME
ORDER BY 1

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