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MySQLi Articles
Page 188 of 341
Display two different columns from two different tables with ORDER BY?
For this, you can use UNION along with the ORDER BY clause. Let us first create a table −mysql> create table DemoTable1 ( Amount int ); Query OK, 0 rows affected (0.63 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1 values(234); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable1 values(567); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable1 values(134); Query OK, 1 row affected (0.43 sec)Display all records from the table using select statement −mysql> select *from DemoTable1;This will produce the following output −+--------+ | Amount | +--------+ ...
Read MoreUsing MySQL keywords in a query surrounded with single quotes?
If there are multiple MySQL keywords in a query, use backticks symbol rather than single quotes. Let us first create a table. Here, we have used two reserved keywords i.e. ‘key’ and ‘Limit’ −mysql> create table DemoTable ( `key` int NOT NULL AUTO_INCREMENT PRIMARY KEY , `Limit` int ); Query OK, 0 rows affected (0.72 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(`key`, `Limit`) values(null, 80); Query OK, 1 row affected (0.49 sec) mysql> insert into DemoTable(`key`, `Limit`) values(null, 90); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable(`key`, `Limit`) values(null, ...
Read MoreMySQL SELECT to skip first N results?
To skip records in MySQL SELECT, use OFFSET. Let us first create a table−mysql> create table DemoTable ( Name varchar(40) ); Query OK, 0 rows affected (0.63 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Chris'); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable values('Robert'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('Mike'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values('Bob'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values('David'); Query OK, 1 row affected (0.11 sec)Display all records from ...
Read MoreHow to speed up SELECT DISTINCT in MySQL
To speed up SELECT DISTINCT, you can create an index on the column or set of columns. Let us first create a table −mysql> create table DemoTable ( Name varchar(40) ); Query OK, 0 rows affected (1.13 sec)Following is the query to create an index −mysql> create index Name_Index on DemoTable(Name); Query OK, 0 rows affected (1.56 sec) Records: 0 Duplicates: 0 Warnings: 0Insert some records in the table using insert command −mysql> insert into DemoTable values('Chris'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('Mike'); Query OK, 1 row affected (0.15 sec) mysql> insert into ...
Read MoreMySQL query to calculate the total amount from column values with Cost and Quantity?
Let us first create a table −mysql> create table DemoTable ( Cost int, Quantity int ); Query OK, 0 rows affected (0.80 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(65, 2); Query OK, 1 row affected (0.08 sec) mysql> insert into DemoTable values(290, 4); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values(40, 3); Query OK, 1 row affected (0.10 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+------+----------+ | Cost | Quantity | +------+----------+ | 65 ...
Read MoreMySQL query to check if a string contains a word?
For this, you can use the LIKE operator along with CONCAT() function. Let us first create a table −mysql> create table DemoTable ( Value text ); Query OK, 0 rows affected (0.63 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('MySQL'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('Is'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values('Relational'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('Database'); Query OK, 1 row affected (0.13 sec)Display all records from the table using select statement −mysql> select ...
Read MoreHow to select all the records except a row with certain id from a MySQL table?
To avoid displaying a certain id from a table, you need to use the operator, which is the NOT EQUAL operator. Let us first create a table −mysql> create table DemoTable7 ( StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, StudentName varchar(40) ); Query OK, 0 rows affected (0.53 sec)Insert some records in the table using insert command −mysql> insert into DemoTable7(StudentName) values('Chris'); Query OK, 1 row affected (0.25 sec) mysql> insert into DemoTable7(StudentName) values('Robert'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable7(StudentName) values('Mike'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable7(StudentName) ...
Read MoreHow to update empty string to NULL in MySQL?
For this, use LENGTH(), since if the length is 0 that would mean the string is empty. After finding, you can set it to NULL using the SET clause in the UPDATE command. Let us first create a table −mysql> create table DemoTable ( Name varchar(50) ); Query OK, 0 rows affected (0.68 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Chris'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values(''); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('David'); Query OK, 1 row affected (0.12 sec) mysql> ...
Read MoreGet the first 10 rows followed by the syntax to display remaining row records with a single MySQL query
Let us first create a table −mysql> create table DemoTable ( Id int ); Query OK, 0 rows affected (0.71 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(100); Query OK, 1 row affected (0.31 sec) mysql> insert into DemoTable values(101); Query OK, 1 row affected (0.26 sec) mysql> insert into DemoTable values(102); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values(103); Query OK, 1 row affected (0.64 sec) mysql> insert into DemoTable values(104); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values(105); Query OK, 1 row affected ...
Read MoreMySQL query to display the first alphabet from strings in a separate column
To fetch the first alphabet from the strings, use LEFT(). This method allows you to return characters from the left of the string.Let us first see an example and create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, FirstName varchar(100) ); Query OK, 0 rows affected (1.03 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(FirstName) values('John'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable(FirstName) values('Adam'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable(FirstName) values('Jace'); Query OK, 1 row affected (0.16 sec) ...
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