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Database Articles
Page 330 of 547
Perform multiple inserts with INSERT INTO SELECT and UNION in MySQL
To perform multiple inserts, the syntax is as follows −insert into yourTableName(yourColumnName1, yourColumnName2, yourColumnName3, ..N) select yourValue1 as yourColumnName1, yourValue2 as yourColumnName2, yourValue3 as yourColumnName3, ......N union select yourValue1 as yourColumnName1, yourValue2 as yourColumnName2, yourValue3 as yourColumnName3, ......N . . NTo understand the above syntax, let us create a table −mysql> create table DemoTable1936 ( StudentId int, StudentName varchar(20), StudentCountryName varchar(20) ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1936(StudentId, StudentName, StudentCountryName) select 1001 as StudentId, 'Chris' as StudentName, 'US' ...
Read MoreMySQL query to display records from a table filtered using LIKE with multiple words?
For this, use RLIKE and filter records as in the below syntax &Minus;select * from yourTableName where yourColumnName rlike 'yourValue1|yourValue2';Let us first create a table −mysql> create table DemoTable1935 ( Subject varchar(20) ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1935 values('MySQL'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1935 values('Python'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1935 values('MongoDB'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1935 values('SQL Server'); Query OK, 1 row affected (0.00 ...
Read MoreMySQL query to select average from distinct column of table?
For getting average, use AVG() and use it with DISTINCT to calculate from distinct records. Let us first create a table −mysql> create table DemoTable1934 ( StudentName varchar(20), StudentMarks int ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1934 values('Chris', 56); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1934 values('Chris', 56); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1934 values('David', 78); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1934 values('David', 78); Query OK, 1 row affected ...
Read MoreSelect items based on value first, then order on the basis of date for rest of the records in MySQL
Use ORDER BY to fix a record and then displayselect * from yourTableName order by yourColumnName1=yourValue desc, yourColumnName2;Let us first create a table −mysql> create table DemoTable1932 ( UserName varchar(20), ShippingDate date ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1932 values('Chris', '2018-10-12'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1932 values('David', '2019-04-11'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1932 values('Mike', '2016-12-04'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1932 values('Carol', '2017-12-26'); Query OK, 1 ...
Read MoreExtract the month and year in the following format: "mm-yyyy" (month year) along with all columns in MySQL?
For month and year in a specific format, use DATE_FORMAT() along with STR_TO_DATE(). Let us first create a table −mysql> create table DemoTable1931 ( ShippingDate varchar(40) ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1931 values('10-11-2017'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1931 values('31-01-2019'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1931 values('02-02-2018'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1931 values('10-06-2013'); Query OK, 1 row affected (0.00 sec)Display all records from the table using select ...
Read MoreMySQL query to add days with interval of 45 days and display the output in a new column
For this, you can use date_add(). Let us first create a table −mysql> create table DemoTable1930 ( DueTime datetime ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1930 values('2017-10-21'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1930 values('2019-12-14'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1930 values('2018-11-26'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1930 values('2014-06-16'); Query OK, 1 row affected (0.00 sec)Display all records from the table using select statement −mysql> select * from DemoTable1930;This will ...
Read MoreReset Primary Key in MySQL
To reset primary key, at first use TRUNCATE table, then use ALTER TABLE. Let us first create a table −mysql> create table DemoTable1929 ( UserId int NOT NULL AUTO_INCREMENT, PRIMARY KEY(UserId) ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1929 values(); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1929 values(); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1929 values(); Query OK, 1 row affected (0.00 sec)Display all records from the table using select statement −mysql> select * from DemoTable1929;This ...
Read MoreDisplay first non-null values with coalesce() in MySQL?
The coalesce() can be used to print first NOT NULL column value. Let us first create a table −mysql> create table DemoTable1927 ( StudentName varchar(20), StudentSubject varchar(20) ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1927 values('Chris', 'MySQL'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1927 values('David', NULL); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1927 values(NULL, 'MongoDB'); Query OK, 1 row affected (0.00 sec)Display all records from the table using select statement −mysql> select * from DemoTable1927;This will ...
Read MoreHow to select rows if initial ones are randomized and the rest ordered by criteria with MySQL?
For this, you can use ORDER BY CASE statement. Let us create a table −mysql> create table DemoTable1926 ( Position varchar(20), Number int ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1926 values('Highest', 50); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1926 values('Highest', 30); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1926 values('Lowest', 100); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1926 values('Lowest', 120); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1926 values('Lowest', ...
Read MoreHow to update a specific column value fetched with CASE statement?
For this, use UPDATE command along with CASE statement. Let us first create a table −mysql> create table DemoTable1925 ( StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, StudentName varchar(20), StudentMarks int ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1925(StudentName, StudentMarks) values('Chris', 98); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1925(StudentName, StudentMarks) values('David', 45); Query OK, 1 row affected (0.00 sec)Display all records from the table using select statement −mysql> select * from DemoTable1925;This will produce the following output −+-----------+-------------+--------------+ | ...
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