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89 lines
3 KiB
Text
89 lines
3 KiB
Text
SET @save = @@global.group_concat_max_len;
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DROP TABLE IF EXISTS t1;
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## Creating new table t1 ##
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CREATE TABLE t1
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(
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id INT NOT NULL AUTO_INCREMENT,
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PRIMARY KEY (id),
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rollno INT NOT NULL,
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name VARCHAR(30)
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);
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'#--------------------FN_DYNVARS_034_01-------------------------#'
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## Setting initial value of variable to 4 ##
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SET @@global.group_concat_max_len = 4;
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## Inserting some rows in table ##
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INSERT INTO t1(rollno, name) VALUES(1, 'Record_1');
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INSERT INTO t1(rollno, name) VALUES(2, 'Record_2');
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INSERT INTO t1(rollno, name) VALUES(1, 'Record_3');
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INSERT INTO t1(rollno, name) VALUES(3, 'Record_4');
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INSERT INTO t1(rollno, name) VALUES(1, 'Record_5');
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INSERT INTO t1(rollno, name) VALUES(3, 'Record_6');
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INSERT INTO t1(rollno, name) VALUES(4, 'Record_7');
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INSERT INTO t1(rollno, name) VALUES(4, 'Record_8');
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SELECT * FROM t1 ORDER BY id;
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id rollno name
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1 1 Record_1
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2 2 Record_2
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3 1 Record_3
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4 3 Record_4
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5 1 Record_5
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6 3 Record_6
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7 4 Record_7
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8 4 Record_8
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## Creating two new connections ##
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'#--------------------FN_DYNVARS_034_02-------------------------#'
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## Connecting with test_con1 ##
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## Accessing data and using group_concat on column whose value is greater than 4 ##
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SELECT id, rollno, GROUP_CONCAT(name) FROM t1 GROUP BY rollno;
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id rollno GROUP_CONCAT(name)
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1 1 Reco
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2 2 Reco
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4 3 Reco
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7 4 Reco
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Warnings:
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Warning 1260 4 line(s) were cut by GROUP_CONCAT()
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## Changing session value of variable and verifying its behavior, ##
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## warning should come here ##
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SET @@session.group_concat_max_len = 10;
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SELECT id, rollno, GROUP_CONCAT(name) FROM t1 GROUP BY rollno;
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id rollno GROUP_CONCAT(name)
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1 1 Record_1,R
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2 2 Record_2
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4 3 Record_4,R
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7 4 Record_7,R
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Warnings:
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Warning 1260 3 line(s) were cut by GROUP_CONCAT()
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'#--------------------FN_DYNVARS_034_03-------------------------#'
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## Connecting with new connection test_con2 ##
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## Verifying initial value of variable. It should be 4 ##
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SELECT @@session.group_concat_max_len = 4;
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@@session.group_concat_max_len = 4
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1
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## Setting session value of variable to 20 and verifying variable is concating ##
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## column's value to 20 or not ##
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SET @@session.group_concat_max_len = 20;
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## Verifying value of name column, it should not me more than 20 characters ##
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## Warning should come here ##
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SELECT id, rollno, GROUP_CONCAT(name) FROM t1 GROUP BY rollno;
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id rollno GROUP_CONCAT(name)
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1 1 Record_1,Record_3,Re
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2 2 Record_2
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4 3 Record_4,Record_6
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7 4 Record_7,Record_8
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Warnings:
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Warning 1260 1 line(s) were cut by GROUP_CONCAT()
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'#--------------------FN_DYNVARS_034_04-------------------------#'
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## Setting session value of variable to 26. No warning should appear here ##
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## because the value after concatination is less than 30 ##
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SET @@session.group_concat_max_len = 26;
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## Verifying value of name column, it should not give warning now ##
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SELECT id, rollno, GROUP_CONCAT(name) FROM t1 GROUP BY rollno;
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id rollno GROUP_CONCAT(name)
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1 1 Record_1,Record_3,Record_5
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2 2 Record_2
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4 3 Record_4,Record_6
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7 4 Record_7,Record_8
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## Dropping table t1 ##
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DROP TABLE t1;
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## Disconnecting both the connection ##
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SET @@global.group_concat_max_len = @save;
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