Alter Columns Document Gratis
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How do I change the datatype of a column in a table?
ALTER TABLE “table_name” MODIFY “column_name” “New Data Type”;
ALTER TABLE “table_name” ALTER COLUMN “column_name” “New Data Type”;
ALTER TABLE Customer MODIFY Address char(100);
ALTER TABLE Customer MODIFY Address char(100);
ALTER TABLE Customer ALTER COLUMN Address char(100);
How do you change the datatype of a column?
ALTER TABLE “table_name” MODIFY “column_name” “New Data Type”;
ALTER TABLE “table_name” ALTER COLUMN “column_name” “New Data Type”;
ALTER TABLE Customer MODIFY Address char(100);
ALTER TABLE Customer MODIFY Address char(100);
ALTER TABLE Customer ALTER COLUMN Address char(100);
How do I change the datatype of a column in PostgreSQL?
First, specify the name of the table to which the column you want to change belong in the ALTER TABLE clause.
Second, give the name of column whose data type will be changed in the ALTER COLUMN clause.
Third, provide the new data type for the column after the TYPE keyword.
How do you delete a column?
ALTER TABLE “table_name” DROP “column_name”;
ALTER TABLE “table_name” DROP COLUMN “column_name”;
ALTER TABLE Customer DROP Birth_Date;
ALTER TABLE Customer DROP COLUMN Birth_Date;
ALTER TABLE Customer DROP COLUMN Birth_Date;
How do you delete a row from a table?
First, you specify the table name where you want to remove data in the DELETE FROM clause.
Second, you put a condition in the WHERE clause to specify which rows to remove. If you omit the WHERE clause, the statement will remove all rows in the table.
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