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MySQLi Articles
Page 182 of 341
How to create a new table from the first table using MySQL LIKE?
Let us first create a table −mysql> create table DemoTable1 ( EmployeeId int NOT NULL AUTO_INCREMENT PRIMARY KEY, EmployeeName varchar(50) ); Query OK, 0 rows affected (0.48 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1(EmployeeName) values('Tom'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable1(EmployeeName) values('Mike'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable1(EmployeeName) values('Emma'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable1(EmployeeName) values('Sam'); Query OK, 1 row affected (0.10 sec)Display all records from the table using select statement::mysql> select *from DemoTable1;This will produce the ...
Read MoreHow to check the column values have string or digits in MySQL?
If you want only the string values, then use the below syntax −select *from yourTableName where yourColumnName NOT regexp '^[0-9]+$';If you want only the digit, then use the below syntax −select *from yourTableName where yourColumnName regexp '^[0-9]+$';Let us first create a table −mysql> create table DemoTable( Id varchar(100) ); Query OK, 0 rows affected (0.49 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('1000'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values('John'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values('Carol_Smith'); Query OK, 1 row affected (0.15 ...
Read MoreInsert multiple values in a temporary table with a single MySQL query?
Let us first create a table −mysql> create temporary table DemoTable ( SerialNumber int ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command. Here, we are inserting multiple values in a temporary table −mysql> insert into DemoTable values(1),(2),(3),(4),(5),(6),(7),(8); Query OK, 8 rows affected (0.00 sec) Records: 8 Duplicates: 0 Warnings: 0Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+--------------+ | SerialNumber | +--------------+ | 1 | | 2 | | 3 | | 4 | | 5 | | 6 | | 7 | | 8 | +--------------+ 8 rows in set (0.00 sec)
Read MoreCheck if the column values are the same among multiple records and set these records in a single row separated by a special character in MySQL
For this, you can use GROUP_CONCAT() along with DISTINCT. Let us first create a table −mysql> create table DemoTable ( Id int, Subject varchar(40) ); Query OK, 0 rows affected (0.56 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(100, 'MySQL'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values(100, 'MongoDB'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values(100, 'Java'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(100, 'MongoDB'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values(101, 'MySQL'); ...
Read MoreMySQL query to display only the records that contains single word?
For this, you can filter records on the basis of LIKE. Let us first create a table −mysql> create table DemoTable ( Name varchar(50) ); Query OK, 0 rows affected (0.50 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('John Smith'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('John'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values('Adam Smith'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values('Carol'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values('David Miller'); Query OK, 1 ...
Read MoreMySQL query to sort increasing the difference between n and the value in the table?
For sort by distance, use ORDER BY ABS(). Let us first create a table −mysql> create table DemoTable ( Number int ); Query OK, 0 rows affected (1.16 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(100); Query OK, 1 row affected (0.51 sec) mysql> insert into DemoTable values(101); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values(102); Query OK, 1 row affected (0.46 sec) mysql> insert into DemoTable values(103); Query OK, 1 row affected (0.84 sec) mysql> insert into DemoTable values(104); Query OK, 1 row affected (0.17 sec) mysql> insert ...
Read MoreFetch date record that equals today in MySQL
For this, compare the date records with the current date using the CURDATE() method. Let us first create a table −mysql> create table DemoTable ( RegistrationLastDate datetime ); Query OK, 0 rows affected (0.61 sec)Let’s say the current date is −2019-09-03Insert some records in the table using insert command −mysql> insert into DemoTable values('2019-08-01'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('2019-09-03 9:50:56'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('2019-09-03'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('2019-09-02'); Query OK, 1 row affected (0.18 sec) mysql> ...
Read MoreHow to create NVARCHAR column in MySQL?
The MySQL converts NVARCHAR() to VARCHAR(). NVARCHAR stands for National Varchar in MySQL. Let us first create a table with one of the columns “StudentName” as NVARCHAR −mysql> create table DemoTable ( StudentName NVARCHAR(40), StudentCountryName VARCHAR(50) ); Query OK, 0 rows affected, 1 warning (0.49 sec)Let us check the description of the table −mysql> desc DemoTable;This will produce the following output. As you can see below, the StudentName column with NVARCHAR type is automatically converted to VARCHAR in MySQL −+--------------------+-------------+------+-----+---------+-------+ | Field | Type ...
Read MoreMySQL query to update all the values in a column with numeric incremental values like John1, John2, John3, etc.
To update all the values in a column to John1, John2, etc.; you need to set incremental values 1, 2, 3, etc. and concatenate them to the records. Let us first create a table −mysql> create table DemoTable ( StudentId varchar(80) ); Query OK, 0 rows affected (0.50 sec)Insert some records in the table using insert command. Here, for our example, we have set similar names −mysql> insert into DemoTable values('John'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('John'); Query OK, 1 row affected (0.08 sec) mysql> insert into DemoTable values('John'); Query OK, 1 row ...
Read MoreHow to delete records based on a word with underscore like MONTH_JAN'?
For this, you can use LIKE operator. Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Name varchar(40), BornMonth varchar(40) ); Query OK, 0 rows affected (0.47 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Name, BornMonth) values('Chris', 'MONTH_DEC'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable(Name, BornMonth) values('Bob', 'MONTH_JAN'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable(Name, BornMonth) values('Mike', 'MONTH_FEB'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable(Name, BornMonth) values('David', 'MONTH_JAN'); Query OK, 1 ...
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