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Database Articles
Page 348 of 547
What is the proper way to insert an IF statement into a MySQL query?
To insert an IF statement into a MySQL query, use the below syntax::select yourColumnName ,if(yourCondition, yourStatement1, yourStatement2) from yourTableName;Let us first create a table −mysql> create table DemoTable1571 -> ( -> Id int, -> Value int -> ); Query OK, 0 rows affected (5.63 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1571 values(101, 500); Query OK, 1 row affected (1.07 sec) mysql> insert into DemoTable1571 values(102, 450); Query OK, 1 row affected (0.47 sec) mysql> insert into DemoTable1571 values(103, 300); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable1571 ...
Read MoreHow to make a MySQL Connection in JAVA? What is the port number to set on locahost?
You need to use port number 3306 in the URL. The syntax is as follows −jdbc:mysql://localhost:3306Exampleimport java.sql.Connection; import java.sql.DriverManager; public class MySQLConnectionToJava { public static void main(String[] args) { String JDBCURL="jdbc:mysql://localhost:3306/sample?useSSL=false"; Connection con=null; try { con = DriverManager.getConnection(JDBCURL,"root","123456"); if(con!=null) { System.out.println("MySQL connection is successful with port 3306."); } } catch(Exception e) { e.printStackTrace(); } } }OutputMySQL connection is successful with port 3306.
Read MoreMySQL insert a value to specific row and column
Let us first create a table −mysql> create table DemoTable1569 -> ( -> StudentId varchar(10), -> StudentName varchar(20) -> ); Query OK, 0 rows affected (3.05 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1569 values('John_12', 'John Smith'); Query OK, 1 row affected (0.38 sec) mysql> insert into DemoTable1569 values('David_321', 'Carol Taylor'); Query OK, 1 row affected (0.50 sec) mysql> insert into DemoTable1569 values('David_989', 'David Miller'); Query OK, 1 row affected (0.24 sec)Display all records from the table using select statement −mysql> select * from DemoTable1569;This will produce the following output+-----------+--------------+ | ...
Read MoreFinding total number of rows of tables across multiple databases in MySQL?
To fetch total number of table rows across databases, use aggregate function SUM() along with INFORMATION SCHEMA. Let us first create a table, which is in “web” database −mysql> create table DemoTable1568 -> ( -> Name varchar(20) -> ); Query OK, 0 rows affected (0.61 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1568 values('Chris'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable1568 values('Bob'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable1568 values('David'); Query OK, 1 row affected (0.13 sec)Display all records from the table using select ...
Read MoreGetting the last 30 rows in MySQL
To get the last 30 rows in MySQL, you need to use ORDER BY DESC and then LIMIT 30. The syntax is as follows −select * from yourTableName order by yourColumnName DESC LIMIT 30;Let us first create a table −mysql> create table DemoTable1567 -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY -> ); Query OK, 0 rows affected (0.82 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1567 values(), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), ...
Read MoreUsing CASE statement in MySQL to display custom name for empty value
For this, you can use CASE WHEN statement. Let us first create a table −mysql> create table DemoTable -> ( -> Name varchar(20) -> ); Query OK, 0 rows affected (0.62 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Chris'); Query OK, 1 row affected (0.15 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 (0.11 sec) mysql> insert into DemoTable values(''); Query OK, 1 row affected (0.11 sec)Display all records from the table using select statement −mysql> ...
Read MoreMySQL query to display custom text for empty columns
Let us first create a table −mysql> create table DemoTable -> ( -> FirstName varchar(20) -> ); Query OK, 0 rows affected (0.77 sec)Insert 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(''); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values('David'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('Bob'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(''); Query OK, 1 row affected (0.13 sec)Display all records from the table ...
Read MoreWrap around to first value and implement MySQL ORDER BY ASC and DESC in a single query
Let us first create a table −mysql> create table DemoTable -> ( -> Value int -> ); Query OK, 0 rows affected (3.21 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(20); Query OK, 1 row affected (0.78 sec) mysql> insert into DemoTable values(40); Query OK, 1 row affected (0.94 sec) mysql> insert into DemoTable values(30); Query OK, 1 row affected (0.41 sec) mysql> insert into DemoTable values(10); Query OK, 1 row affected (0.26 sec) mysql> insert into DemoTable values(90); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable values(70); ...
Read MoreFind second max in a table using MySQL query?
You can use LIMIT 1 OFFSET 1. Let us first create a table −mysql> create table DemoTable -> ( -> Value int -> ); Query OK, 0 rows affected (0.92 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(1); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(2); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable values(4); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable values(204); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values(5); Query OK, 1 row affected ...
Read MoreMySQL TINYINT type to return <>1 or IS NULL records
Let us first create a table −mysql> create table DemoTable -> ( -> EmployeeId int NOT NULL AUTO_INCREMENT PRIMARY KEY , -> EmployeeName varchar(20), -> isMarried tinyint -> ); Query OK, 0 rows affected (0.83 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(EmployeeName, isMarried) values('Chris', NULL); Query OK, 1 row affected (0.76 sec) mysql> insert into DemoTable(EmployeeName, isMarried) values('David', 1); Query OK, 1 row affected (0.35 sec) mysql> insert into DemoTable(EmployeeName, isMarried) values('Mike', 0); Query OK, 1 row affected (0.69 sec) mysql> insert into DemoTable(EmployeeName, isMarried) values('Sam', NULL); Query OK, ...
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