Database Articles

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MySQL CONCAT a specific column value with the corresponding record

AmitDiwan
AmitDiwan
Updated on 26-Sep-2019 187 Views

Let us first create a table −mysql> create table DemoTable (    FirstName varchar(100),    CountryName varchar(100) ); Query OK, 0 rows affected (0.56 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Adam', 'US'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('David', 'AUS'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('Chris', 'UK'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values('John', 'US'); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable values('Carol', 'AUS'); Query OK, 1 row affected (0.14 sec)Display all records ...

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How to find a specific record from a list of values with semicolon in MySQL?

AmitDiwan
AmitDiwan
Updated on 26-Sep-2019 187 Views

For this, you can use FIND_IN_SET(). Let us first create a table −mysql> create table DemoTable (    Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    Value varchar(100) ); Query OK, 0 rows affected (2.49 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Value) values('100;200;300'); Query OK, 1 row affected (0.42 sec) mysql> insert into DemoTable(Value) values('1;300;400'); Query OK, 1 row affected (0.58 sec) mysql> insert into DemoTable(Value) values('6;7;8;9;10'); Query OK, 1 row affected (0.29 sec) mysql> insert into DemoTable(Value) values('1;2;3;4;5'); Query OK, 1 row affected (9.36 sec) mysql> insert into DemoTable(Value) values('3;8;9;10'); Query OK, 1 ...

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MySQL query to order timestamp in descending order but place the timestamp 0000-00-00 00:00:00 first?

AmitDiwan
AmitDiwan
Updated on 26-Sep-2019 1K+ Views

Let us first create a table &mnus;mysql> create table DemoTable (    `timestamp` timestamp ); Query OK, 0 rows affected (1.12 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(now()); Query OK, 1 row affected (0.27 sec) mysql> insert into DemoTable values('00:00:00'); Query OK, 1 row affected (0.73 sec) mysql> insert into DemoTable values('2018-01-10 12:34:45'); Query OK, 1 row affected (0.80 sec) mysql> insert into DemoTable values('2019-12-31 10:50:45'); Query OK, 1 row affected (0.84 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+---------------------+ | timestamp ...

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MySQL group_concat to add a separator for empty fields?

AmitDiwan
AmitDiwan
Updated on 26-Sep-2019 473 Views

For this, you can use replace() along with group_concat(). Here, for empty fields, we are displaying a comma as a separator. Let us first create a table −mysql> create table DemoTable (    Id int,    Number varchar(100) ); Query OK, 0 rows affected (2.03 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(10, '456'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values(11, '345'); Query OK, 1 row affected (0.28 sec) mysql> insert into DemoTable values(10, ''); Query OK, 1 row affected (0.63 sec) mysql> insert into DemoTable values(10, '278'); Query ...

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How to ORDER BY DESC and display the first 3 records in MySQL?

AmitDiwan
AmitDiwan
Updated on 26-Sep-2019 724 Views

For this, you can use ORDER BY DESC with LIMIT. Let us first create a table −mysql> create table DemoTable (    UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY,    UserName varchar(100) ); Query OK, 0 rows affected (0.59 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(UserName) values('Chris'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable(UserName) values('Robert'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable(UserName) values('Bob'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable(UserName) values('David'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable(UserName) ...

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MySQL ORDER BY strings with underscore?

AmitDiwan
AmitDiwan
Updated on 26-Sep-2019 392 Views

Let us first create a table −mysql> create table DemoTable (    Name varchar(100) ); Query OK, 0 rows affected (0.60 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('John_Smith'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values('Chris Brown'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('John_Doe'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values('David Miller'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values('Carol Taylor'); Query OK, 1 row affected (0.13 sec)Display all records from the table using select ...

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Insert multiple rows from another table but the inserted records should be distinct

AmitDiwan
AmitDiwan
Updated on 26-Sep-2019 341 Views

For this, you can use DISTINCT along with the INSERT INTO SELECT statement. Let us first create a table −mysql> create table DemoTable1 (    Value int ); Query OK, 0 rows affected (1.03 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1 values(50); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable1 values(10); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable1 values(10); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable1 values(60); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable1 values(50); Query OK, 1 row ...

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Limit the count using GROUP BY in MySQL

AmitDiwan
AmitDiwan
Updated on 26-Sep-2019 1K+ Views

Let us first create a table −mysql> create table DemoTable (    UserId int,    UserMessage varchar(100) ); Query OK, 0 rows affected (0.51 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(1, 'Hi'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable values(2, 'Hello'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values(2, 'Good'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values(1, 'Nice'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values(1, 'Awesome'); Query OK, 1 row affected (0.16 sec) mysql> insert ...

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How to get MySQL query result in same order as given by IN clause?

AmitDiwan
AmitDiwan
Updated on 26-Sep-2019 1K+ Views

For this, you can use IN() along with ORDER BY FIELD(). Let us first create a table −mysql> create table DemoTable (    Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    FirstName varchar(100) ); Query OK, 0 rows affected (0.64 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(FirstName) values('Chris'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable(FirstName) values('Robert'); Query OK, 1 row affected (0.08 sec) mysql> insert into DemoTable(FirstName) values('Mike'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable(FirstName) values('Sam'); Query OK, 1 row affected (0.12 sec) mysql> insert into ...

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How to display all the MySQL tables in one line?

AmitDiwan
AmitDiwan
Updated on 26-Sep-2019 633 Views

Use information_schema.tables to display all the tables. With that, se the database name as well, so that you can display tables only from a specific database.Let us now display all the tables in the database “web” −mysql> select group_concat(table_name) from information_schema.tables where table_schema='web';This will produce the following output −+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | group_concat(table_name) | +------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | demo_table725, demotabe619, demotabe620, demotable211, demotable212, demotable213, demotable214, demotable215, demotable216, demotable217, demotable218, demotable219, demotable220, demotable221, demotable222, demotable223, demotable224, demotable225, demotable226, demotable227, demotable228, demotable229, demotable230, demotable231, demotable232, demotable233, demotable234, demotable235, demotable236, demotable237, demotable238, demotable239, demotable240, demotable241, demotable244, demotable245, demotable246, demotable247, demotable248, demotable249, demotable250, demotable251, demotable252, demotable 253, demotable254, ...

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