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MySQLi Articles
Page 194 of 341
Use LIKE % to fetch multiple values in a single MySQL query
To fetch multiple values wit LIKE, use the LIKE operator along with OR operator. Let us first create a table −mysql> create table DemoTable1027 ( Id int, Name varchar(100) ); Query OK, 0 rows affected (1.64 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1027 values(100, 'John'); Query OK, 1 row affected (0.72 sec) mysql> insert into DemoTable1027 values(20, 'Chris'); Query OK, 1 row affected (0.56 sec) mysql> insert into DemoTable1027 values(200, 'Robert'); Query OK, 1 row affected (0.84 sec) mysql> insert into DemoTable1027 values(400, 'Mike'); Query OK, 1 row affected (0.47 sec)Display all ...
Read MoreMySQL select query to fetch data with null value?
Let us first create a table −mysql> create table DemoTable ( CustomerName varchar(100), CustomerCountryName varchar(100) ); Query OK, 0 rows affected (0.95 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Chris', 'US'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values('Bob', 'UK'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values('Carol', NULL); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('David', 'AUS'); Query OK, 1 row affected (0.32 sec) mysql> insert into DemoTable values('Mike', NULL); Query OK, 1 row affected (0.18 sec)Display all records ...
Read MoreShow column value twice in MySQL Select?
You can use concat(). Let us first create a table −mysql> create table DemoTable ( Value int ); Query OK, 0 rows affected (0.73 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(100); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values(200); Query OK, 1 row affected (0.08 sec) mysql> insert into DemoTable values(100); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values(200); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values(200); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values(100); Query ...
Read MoreGet count of zeros for columns values declared with INT type in MySQL
For this, you can use LENGTH() along with REPLACE(). Let us first create a table −mysql> create table DemoTable ( Value int ); Query OK, 0 rows affected (1.22 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(10002000); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable values(00000); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values(400560); Query OK, 1 row affected (0.19 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+----------+ | Value | +----------+ | 10002000 ...
Read MoreReturn value from a row if it is NOT NULL, else return the other row value in another column with MySQL
For this, you can use IFNULL(). Let us first create a table −mysql> create table DemoTable ( FirstName varchar(100), LastName varchar(100) ); Query OK, 0 rows affected (0.62 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('John', 'Doe'); Query OK, 1 row affected (0.29 sec) mysql> insert into DemoTable values(NULL, 'Taylor'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('David', NULL); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(NULL, 'Miller'); Query OK, 1 row affected (0.12 sec)Display all records from the table using select statement −mysql> ...
Read MoreMySQL query to compare and display only the rows with NULL values
For this, you can use IFNULL(). Let us first create a table −mysql> create table DemoTable ( Value1 int, Value2 int ); Query OK, 0 rows affected (0.75 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(10, NULL); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values(20, 40); Query OK, 1 row affected (0.27 sec) mysql> insert into DemoTable values(3, NULL); Query OK, 1 row affected (0.20 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+--------+--------+ | Value1 | Value2 ...
Read MoreMySQL UNIQUE declaration to avoid inserting duplicate values?
Following is the declaration for a UNIQUE clause in MySQL −create table yourTableName ( yourColumnName1 dataType, yourColumnName2 dataType, UNIQUE(yourColumnName1), UNIQUE(yourColumnName1) );Let us first create a table −mysql> create table DemoTable ( Value int, Value2 int, UNIQUE(Value), UNIQUE(Value2) ); Query OK, 0 rows affected (13.98 sec)Insert some records in the table using insert command. Here, duplicate records won’t insert because we have used UNIQUE above −mysql> insert into DemoTable values(10, 20) ; Query OK, 1 row affected (0.32 sec) mysql> insert into DemoTable values(10, 30); ERROR 1062 (23000): Duplicate entry '10' for key ...
Read MoreDisplay distinct dates in MySQL from a column with date records
Let us first create a table −mysql> create table DemoTable ( AdmissionDate datetime ); Query OK, 0 rows affected (8.99 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('2010-01-10 12:30:45'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('2010-01-10 12:30:45'); Query OK, 1 row affected (0.46 sec) mysql> insert into DemoTable values('2010-01-10 12:30:45'); Query OK, 1 row affected (0.71 sec) mysql> insert into DemoTable values('2010-01-12 12:30:45'); Query OK, 1 row affected (1.22 sec) mysql> insert into DemoTable values('2010-01-20 12:30:45'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values('2010-01-20 ...
Read MoreGet all the tables from a MySQL database having a specific column, let's say xyz?
Let’s say we have a database “web” and we need to get all the tables having a specific column ’StudentFirstName’.For this, below is the query −mysql> select myColumnName.table_name from information_schema.columns myColumnName where myColumnName.column_name = 'StudentFirstName' and table_schema='web';This will produce the following output −+---------------+ | TABLE_NAME | +---------------+ | demotable109 | | demotable297 | | demotable335 | | demotable395 | | demotable418 | | demotable425 | | demotable436 | +---------------+ 7 rows in set (0.14 sec)Therefore, the above tables have one of the column names as “StudentFirstName”.Let us check the description ...
Read MoreHow can I replace & with an ampersand in my MySQL database?
To replace & with an ampersand, use MySQL REPLACE(). 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 (1.06 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Value) values('@amp'); Query OK, 1 row affected (0.33 sec) mysql> insert into DemoTable(Value) values('&'); Query OK, 1 row affected (1.09 sec) mysql> insert into DemoTable(Value) values('#amp'); Query OK, 1 row affected (0.28 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+----+-------+ ...
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