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In contrast, adding a column that allows NULL values and does not specify a default value is a metadata operation only, and involves no locks. When you use CREATE TABLE or ALTER TABLE, database and ...
sql-statement-add-column.md File metadata and controls Preview Code Blame 96 lines (76 loc) · 2.79 KB Raw ...
When you alter the attributes of a column and an index has been defined for that column, the values in the altered column continue to have the index defined for them. If you drop a column with the ...
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